Precalculus

The unit circle, special angles, and right-triangle trig ratios.

Angle-sum, double-angle, and half-angle identities for simplifying and solving.

Solving oblique triangles, including the ambiguous SSA case.

Log laws, change of base, and modeling growth and decay.

Modulus, argument, De Moivre's theorem, and roots of unity.

Using complex numbers to solve rotation, distance, and polygon problems.