Trig Identities

csc

1/sin

sec

1/cos

cot (1/what)

1/tan

tan

sin/cos

cot

cos/sin

sin² + cos²

1

sin² - 1

cos^2

1 + cot²

csc^2

tan² + 1

sec^2

Radian Measure

arc length/radius length

sin(a+b)

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

cos(a+b)

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

sin(2a)

2sin(a)cos(a)

cos(2a)

cos^2(a) - sin^2(a)