AP Precalc - Trigonometry

Cosecant

The reciprocal of sine; hypotenuse over opposite.

Secant

The reciprocal of cosine; hypotenuse over adjacent.

Cotangent

Reciprocal of tangent; adjacent over opposite.

Coterminal angles

Two different rotations that end up in the same place. (Ex. -90 degrees and 270 degrees)

How to get a coterminal angle in the easiest way

Add or subtract 360 degrees (2 pi) from an angle measurement.

Features of quadrant 1

0 to 90 degrees, 0 to pi/2, all trig functions lead to a positive value.

Quadrant 2 features

90 to 180 degrees, pi/2 to pi, ONLY sine is positive.

Quadrant 3 features

180 to 270 degrees, pi to 3pi/2, ONLY tangent is positive.

Quadrant 4 features

270 to 360 degrees, 3pi/2 to 0, ONLY cosine is positive.