Trigonometric Identities Flashcards

Flashcards covering reciprocal, sum and difference, Pythagorean, and double angle trigonometric identities.

csc(θ)

1 / sin(θ)

sin(θ)

1 / csc(θ)

cos(θ)

1 / sec(θ)

tan(θ)

1 / cot(θ)

cot(θ)

1 / tan(θ)

cot(θ)

cos(θ) / sin(θ)

tan(θ)

sin(θ) / cos(θ)

sin(a + b)

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

sin(a - b)

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

cos(a + b)

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

cos(a - b)

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

sin²(θ) + cos²(θ)

1

1 + tan²(θ)

sec²(θ)

1 + cot²(θ)

csc²(θ)

sin(2a)

2sin(a)cos(a)

cos(2a)

cos²(a) - sin²(a)

cos(2a)

2cos²(a) - 1

cos(2a)

1 - 2sin²(a)