Simplifying Trig Identities

Front

What is the Pythagorean identity for sine and cosine?

Back

sin²θ + cos²θ = 1

Front

What is the identity for secant in terms of cosine?

Back

secθ = 1/cosθ

Front

What is the identity for cosecant in terms of sine?

Back

cscθ = 1/sinθ

Front

What is the identity for tangent in terms of sine and cosine?

Back

tanθ = sinθ/cosθ

Front

What is the identity for cotangent in terms of sine and cosine?

Back

cotθ = cosθ/sinθ

Front

What is the relationship between sin²θ and cos²θ?

Back

sin²θ = 1 - cos²θ

Front

What is the relationship between cos²θ and sin²θ?

Back

cos²θ = 1 - sin²θ

Front

What is the double angle formula for sine?

Back

sin(2θ) = 2sinθcosθ

Front

What is the double angle formula for cosine?

Back

cos(2θ) = cos²θ - sin²θ

Front

What is the identity for the tangent of a sum?

Back

tan(A + B) = (tanA + tanB) / (1 - tanAtanB)