The Algebra 2 topic of trigonometry, preparing for studies of Calculus; contains a crash course in Euclidean geometry
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Precalculus 3: Trigonometry
Save on Precalculus 3: Trigonometry with a verified Udemy coupon (checked August 2026). See current price, availability and course details.
by Hania Uscka-Wehlou · ⭐ 4.7 via Udemy · 3,957 students · English
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$9.99$149.9993% OFF
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Tracked since August 27, 2026 to August 27, 2026. Red dot = current price ($9.99) — CoursesWyn records the price on each sync.
Current price
$9.99
Original price
$149.99
Tracked since
August 27, 2026
Last checked
Aug 27
Price and coupon status are recorded from a periodic sync of Udemy’s public catalog. This snapshot was taken on August 27, 2026. Prices are always confirmed at checkout on the provider’s site.
Deal score Computed, methodology below
6.5
/ 10
Discount depth
93%
Udemy rating
4.7 / 5
Popularity
3,957 students
Tracking length
1 day
Score = weighted average of discount depth, how often CoursesWyn re-checks this code, historical price volatility, and how fast past redemptions were claimed. Not an editorial opinion on the course itself.
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Aug 27, 2026Listed by CoursesWyn — price recorded at $9.99Listed
Aug 27, 2026Coupon checked — checkout price $9.99Working
Course details Synced from Udemy
Fields below are pulled from Udemy’s public catalog and recorded when CoursesWyn syncs — they are catalog data, not editorial description.
| Last checked | August 27, 2026 |
| Provider | Udemy |
| Level | All Levels |
| Rating | 4.7 / 5 |
| Students | 3,957 |
| Content | 52 hours · 318 downloadable resources |
| Language | English |
| Requirements | 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) |
| Topics | Teaching & Academics, Math, Trigonometry |
| Certificate | Yes, on completion |
| Access | Lifetime, mobile & TV |
Key Topics Covered From the course description
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.
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