Precalculus 3: Trigonometry — 93% Off Coupon

The Algebra 2 topic of trigonometry, preparing for studies of Calculus; contains a crash course in Euclidean geometry

⭐ 4.7 out of 5(3,957 students enrolled)Created by Hania Uscka-WehlouLast updated: 🌐 English

Course Overview - Key Takeaways

The following summarizes all verified data points for this course, including pricing, duration, instructor, and coupon validity. All data is sourced directly from Udemy and verified by CourseSpeak on .

•Course Title: Precalculus 3: Trigonometry
•Provider: Udemy (listed via CourseSpeak)
•Instructor: Hania Uscka-Wehlou
•Coupon Verified On: August 27, 2026
•Difficulty Level: All Levels
•Category: Teaching & Academics
•Subcategory: Math
•Duration: 52h of on-demand video
•Language: English
•Access: Lifetime access to all course lectures and updates
•Certificate: Official certificate of completion issued by Udemy upon finishing all course requirements
•Top Learning Outcomes: How to solve problems in trigonometry (illustrated with 215 solved problems), in both geometrical and functional contexts, and why these methods work. · You get a crash course in Euclidean geometry: angles, triangles, polygons, similar triangles (proportions), inscribed and circumscribed circles, bisectors, etc. · Number pi: its definition as the ratio of the perimeter to the diameter of a disk, relation to the area of a disk, some geometrical approximations.
•Prerequisites: High-school mathematics, mainly arithmetic; solving simple equations (linear and quadratic) with one unknown; some (but very few) polynomial equations will be solved during the course, but you can skip them if you want to (no problem at all; it will not affect your understanding of trigonometry) · Precalculus 1: Basic notions (mainly the concept of function and related concepts; sets; logic)
•Price: $9.99 with coupon / Regular Udemy price: $149.99. Applying this coupon saves you $140.00 (93% OFF).
•Coupon: Click REDEEM COUPON below to apply discount
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What You'll Learn

This course gives you the following verified skills and competencies in Teaching & Academics:

✓How to solve problems in trigonometry (illustrated with 215 solved problems), in both geometrical and functional contexts, and why these methods work. .
✓You get a crash course in Euclidean geometry: angles, triangles, polygons, similar triangles (proportions), inscribed and circumscribed circles, bisectors, etc. .
✓Number pi: its definition as the ratio of the perimeter to the diameter of a disk, relation to the area of a disk, some geometrical approximations. .
✓The geometric definitions (by ratios in right triangles) of three trigonometric functions (sin, cos, tan) and their reciprocals (secant, cosecant, cotangent). .
✓Exact values of trigonometric functions for angles of 15, 18, 30, 36, 45, 60, 72, 75, and 22.5 degrees: geometric derivations, and with help of formulas. .
✓Solving triangles (finding side lengths and measures of all angles, knowing some of them), both right and oblique, with help of trigonometry. .
✓Degree vs radian: how to use proportions for recalculating degrees to radians and back; reference angles. .
✓The functional definition of sine, cosine and tangent, with help of unit circle and circular movement; properties of these functions. .
✓The definition of trigonometric (circular) functions (sin, cos, tan) for *any* real number using the unit circle in the coordinate system. .
✓Reference Angles Theorem with proof (by geometrical illustration) and applications; supplementary identities and the complementary angle properties. .
✓Periodic functions. Sinusoids: period, amplitude, phase shift, vertical shift. Transformations of graphs of trigonometric functions. .
✓Pythagorean theorem and Pythagorean triples. Law of Cosines, Law of Sines: formulation, proofs, and applications in problem solving. .
✓Various trigonometric identities with proofs, geometrical illustrations, and applications for problem solving. .
✓The Pythagorean Identities; Reciprocal Identities; Quotient Identities; Even/odd identities. .
✓Sum and Difference Identities for sine and cosine with proofs, geometrical illustrations, and applications. .
✓Sum To Product and Product To Sum Formulas for sine and cosine, with derivations and applications. .
✓Double (Half) Angles Identities with geometrical illustrations, proofs, and applications in problem solving. .
✓Inverse functions to sine, cosine and tangent, their definitions, properties and graphs. .
✓Compositions of trigonometric functions with inverse trigonometric functions; identities involving inverse trigonometric functions. .
✓Complex numbers and their trigonometric (polar) form; consequences of the Sum Identities for sin and cos for multiplication of complex numbers in polar form. .
✓De Moivre's formula (positive natural powers of complex numbers) and its application to quick recreation of formulas for sine and cosine of multiples of angles. .
✓Trigonometric equations: various types and corresponding methods for solutions; depicting the solution sets on the graphs and on the unit circle. .
✓You get a sneak peek into trigonometry in a future Calculus class (how some trigonometric formulas are used there). .
✓You get a plethora of geometric illustrations, supporting your intuition and understanding of trigonometry.

Course Requirements & Prerequisites

The following background knowledge and tools are recommended before starting this course. Students without these prerequisites may still enroll but should expect a steeper learning curve:

•High-school mathematics, mainly arithmetic; solving simple equations (linear and quadratic) with one unknown; some (but very few) polynomial equations will be solved during the course, but you can skip them if you want to (no problem at all; it will not affect your understanding of trigonometry)
•Precalculus 1: Basic notions (mainly the concept of function and related concepts; sets; logic)
•You will get a very brief introduction to *complex numbers* in this course, just enough for presenting one of applications of trigonometry, and for a nice illustration of the formulas for sine and cosine of a sum
•Some basic geometry (angles, triangles, polygons); a crash course (6 hours) is provided in Section 2 of this course (can be skipped if you feel that you master basics of geometry)
•You are always welcome with your questions. If something in the lectures is unclear, please, ask. It is best to use QA, so that all the other students can see my additional explanations about the unclear topics. Remember: you are never alone with your doubts, and it is to everybody's advantage if you ask your questions on the forum.

About This Udemy Course

The following is the full official course description as published on Udemy by instructor Hania Uscka-Wehlou. It covers the curriculum structure, teaching methodology, and topic scope for this Teaching & Academics course:

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Course Comparison

Compare features side by side to find the best course for your needs.

FeatureCURRENT
ProviderUdemyUdemy
Price
$9.99$149.99-93%
$9.99$149.99-93%
Rating
4.7(4k)
5.0(257)
Duration52h53h 30m
CouponTPOT_A...TPOT_A...
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Is the Precalculus 3: Trigonometry Coupon Worth It?

Expert review by Josh Smith, Lead Course Reviewer at CourseSpeakUpdated Aug 27, 2026

The short answer is yes — provided the Teaching & Academics skills this course teaches actually line up with what you want to build. The regular price for Precalculus 3: Trigonometry on Udemy is $149.99. The coupon code listed on this page drops that to $9.99 — a saving of $140.00, or 93% off the standard rate. Spread across 52h of on-demand video, that works out to roughly $0.19 per hour of content — less than the cost of a single chapter of most printed teaching & academics textbooks.

A discount is only worth something if the material delivers, and the curriculum here is built around practical outcomes. Hania Uscka-Wehlou walks you through how to solve problems in trigonometry (illustrated with 215 solved problems), in both geometrical and functional contexts, and why these methods work., you get a crash course in Euclidean geometry: angles, triangles, polygons, similar triangles (proportions), inscribed and circumscribed circles, bisectors, etc., and number pi: its definition as the ratio of the perimeter to the diameter of a disk, relation to the area of a disk, some geometrical approximations. — concrete skills you can apply, not abstract theory. It has already been taken by 3,957 students and holds a 4.7-star average from verified reviews, which is a reasonable sign the content holds up in practice.

The bar to entry is low: High-school mathematics, mainly arithmetic; solving simple equations (linear and quadratic) with one unknown; some (but very few) polynomial equations will be solved during the course, but you can skip them if you want to (no problem at all; it will not affect your understanding of trigonometry); Precalculus 1: Basic notions (mainly the concept of function and related concepts; sets; logic). That makes it a realistic choice even if Teaching & Academics is unfamiliar territory. In practical terms, expect around 52h of on-demand video to work through at your own pace. The material is presented in English.

Pros

  • ✓Verified 93% price reduction.
  • ✓High learner satisfaction (4.7/5).
  • ✓Trusted by 3,957 students.
  • ✓Certificate + lifetime access.

Cons

  • !The coupon is time-limited — once it expires, the price tends to revert toward the standard $149.99.
  • !Lifetime access is tied to Udemy staying online; the platform can change its policies.
  • !Budget for the exercises and quizzes too — they add real time on top of the 52h of video.
JS
Josh Smith
Lead Course Reviewer
Credentials →

"At roughly $0.19 an hour of video, Precalculus 3: Trigonometry is priced sensibly for what it actually covers — how to solve problems in trigonometry (illustrated with 215 solved problems), in both geometrical and functional contexts, and why these methods work. and beyond. If Teaching & Academics is on your roadmap and you value the 4.7-star track record, this coupon is worth using while it's still valid."

✓
Final Verdict: Worth It
Saves you $140.00 against the standard Udemy price
New to redeeming coupons? Visit our step-by-step guide for detailed instructions on how to apply coupon codes.Coupon last verified August 27, 2026.At $9.99 you save $140.00 compared to the standard $149.99 price, and Udemy coupons are time-limited — redeem as soon as possible.

Course Rating Summary

This course holds an aggregate rating of 4.7 out of 5 based on 3,957 student reviews on Udemy. The distribution below shows the approximate percentage of students who gave each star rating.

4.7
3,957 Verified Ratings
5 stars
75%
4 stars
15%
3 stars
6%
2 stars
2%
1 star
2%

* Rating distribution is approximated from the aggregate score. Sourced from Udemy. Last verified: August 27, 2026.

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Instructor Profile

Background information on Hania Uscka-Wehlou, the instructor responsible for this course on Udemy.

HU
Hania Uscka-Wehlou
Udemy Instructor
Full Profile ↗
Subject Area
Teaching & Academics
Total Students
3,957+ enrolled
Rating
4.7 / 5.0
Course Duration
52h
Teaching Approach
Practical, project-based instruction built around real-world application of Teaching & Academics skills, with hands-on exercises and quizzes to reinforce each section.

Frequently Asked Questions

The following questions and answers cover the most common queries about this course, its coupon code, pricing, and enrollment process. All answers are based on verified data from Udemy as of August 27, 2026.

About the Author

Josh Smith
Josh Smith
Udemy Coupon Specialist

8+ years finding and verifying the best Udemy deals. Helped thousands of students save on premium courses through curated coupon codes and exclusive discounts.

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