Trig Indentities

1/csc(x)

Sin

1/sin(x)

csc

1/sec(x)

cos

1/cos(x)

sec

1/cot(x)

tan

1/tan(x)

cot

Even identities?

cos

Odd Indentities?

Sin and tan

sin²x + cos²x =

1

tan²x + 1 =

sec²x

cot²x + 1 =

csc²x

sin(A + B)

sinAcosB + cosAsinB

Sin(A - B)

sinAcosB - cosAsinB

Cos (A + B)

cosAcosB - sinAsinB

Sin2x

2sinxcosx

Cos2x

cos²x - sin²x

cos2x (for sin)

1 - 2sin²x

cos2x (for cos)

2cos²x - 1

3-3cos²x

3sinx

1+tan²x

sec²x

1-sin²x

cos²x

1+cot²x

csc²x

cos²x-1

-sin²x

sec²x-tan²x

1

1-sin²x

cos²x

sin²x-1

-cos²x

Restricted domain of tan^-1(x)

(-pie/2, pie/2)

Restricted domain of sin^-1(x)

[-1,1]

Restricted domain of cos^-1(x)

[0, pie]

root 1/4

+- 1/2

root 1/2

+- root2/2

root 3/4

+- root3/2

root 1/3

+- root3/3