Trigonometric Functions:

The sum of all three angles of any triangle is 180° = p rad

Pythagorean Theorem:

c²= a²+ b²

sine, cosine, tangent.

Secant:

sec q = 1/cos q

Cosecant:

csc q = 1/sin q

Cotangent:

cot q = 1/ tan q

cot q = cos q/sin q

tan q = sin q/cos q

and

sin² q + cos² q = 1