AP Precalc Identities

Front

Pythagorean Identities

Back

cos²x + sin²x = 1

1 + tan²x = sec²x

cot²x + 1 = csc²x

Front

Reciprocal Identities

Back

Front

Quotient Identities

Back

Front

Sum/Difference Identity for Sine

Back

Front

Sum/Difference Identity for Cosine

Back

Front

Double Angle Identity for Sine

Back

Front

Double Angle Identity for Cosine (all 3)

Back

cos²u - sin²u

1 - 2sin²u

2cos²u - 1