Trig Identities Formulas

Front

What is the formula for sin(a + b)?

Back

sin(a + b) = sin a cos b + cos a sin b

Front

What is the formula for cos(a - b)?

Back

cos(a - b) = cos a cos b + sin a sin b

Front

What is the Pythagorean identity?

Back

sin^2 x + cos^2 x = 1

Front

What is the formula for csc x?

Back

csc x = \frac{1}{sin x}

Front

What is the formula for sec x?

Back

sec x = \frac{1}{cos x}

Front

What is the formula for tan x?

Back

tan x = \frac{sin x}{cos x}

Front

What is the formula for sin(2x)?

Back

sin(2x) = 2 sin x cos x

Front

What is the formula for cos(2x)?

Back

cos(2x) = cos^2 x - sin^2 x

Front

What is the formula for sin(a - b)?

Back

sin(a - b) = sin a cos b - cos a sin b

Front

What is the formula for cos(a + b)?

Back

cos(a + b) = cos a cos b - sin a sin b