Unit 3: Functions & Identities

From static triangles to moving waves: graph trig functions, rewrite them with identities, and recover angles from ratios safely with arcsin, arccos, and atan2.

Graphs of Trig Functions

Sine, cosine, and tangent waves: amplitude, period, phase shift, and vertical shift.

Fundamental Identities

Pythagorean, reciprocal, quotient, cofunction, and even-odd identities with simplification examples.

Inverse Trig Functions

arcsin, arccos, arctan, and atan2: recovering angles from ratios without quadrant bugs.