Trig To Know By <3

Reciprocal Identity
Sin x =

1/csc x

Reciprocal Identity
cos x =

1/sec x

Reciprocal Identity
tan x =

1/cot x

Reciprocal Identity
csc x =

1/sin x

Reciprocal Identity
sec x =

1/cos x

Reciprocal Identity
cot x =

1/tan x

Quotient Identity
tan x =

sin x/cos x

Quotient Identity
cot x =

cos x/sin x

Pythagorean Identities

sin^2x+cos^2x=1
tan^2x+1=sec^2x
cot^2x+1=csc^2x

sin(A+B)

sinAcosB+cosAsinB

sin(A-B)

sinAcosB-cosAsinB

cos(A+B)

cosAcosB-sinAsinB

cos(A-B)

cosAcosB+sinAsinB

sin(2A)

2sinAcosA

cos(2A)

cos^2A-sin^2A
2cos^2A-1
1-2sin^2A