Track 4 of 6
Trigonometry
Graphs of trig functions, the identities you'll reuse forever, solving trig equations, and the laws that crack non-right triangles.
5 lessons · ~56 min total · 12-question quiz
Lessons
- 01
Graphs of Trig Functions
Amplitude, period, phase shift — and why tangent has asymptotes.
- 02
Trig Identities
Pythagorean, reciprocal, sum/difference, and double-angle — the ones you'll keep reusing.
- 03
Solving Trig Equations
Reference angles, symmetry, and the Pythagorean-substitution trick.
- 04
Law of Sines and Law of Cosines
Solve any triangle, even when SOH CAH TOA gives up.
- 05
Inverse Trig Functions
Arcsin, arccos, arctan — and why their output ranges are restricted.
Section quiz
12 questions covering the lessons above. Instant feedback on each, full review at the end.
Start the quiz