Trigonometric Identities

Front

What is the Pythagorean identity for sine and cosine?

Back

sin²x + cos²x = 1

Front

What is the definition of tangent in terms of sine and cosine?

Back

tan x = sin x / cos x

Front

What is the reciprocal identity for cosecant?

Back

csc x = 1 / sin x

Front

What is the reciprocal identity for secant?

Back

sec x = 1 / cos x

Front

What is the reciprocal identity for cotangent?

Back

cot x = 1 / tan x

Front

What is the relationship between tangent and cotangent?

Back

tan x = 1 / cot x

Front

What is the identity for secant squared in terms of tangent?

Back

sec²x = 1 + tan²x

Front

What is the identity for cosecant squared in terms of cotangent?

Back

csc²x = 1 + cot²x

Front

What is the co-function identity for sine and cosine?

Back

sin(90° - x) = cos x

Front

What is the co-function identity for tangent and cotangent?

Back

tan(90° - x) = cot x