Precalc Hnr-Trig Identities formulas

Pythagorean Identities, Sum and Difference Identities, Double Angle Identities

cos^2 x + sin^2 x=

1

1 - sin^2 x=

cos^2 x

( 1- sin x)(1+ sin x)

cos^2 x

1 - cos^2 x=

sin ^2 x

(1- cos x)(1+cos x)

sin^2 x

1 + tan^2 x=

sec^2 x

sec^2 x- tan^2 x=

1

(sec x - tan x)(sec x + tan x)=

1

tan^2 x-sec^2 x=

-1

(tan x- sec x)(tan x + sec x)=

-1

1 + cot^2 x =

csc^2 x

csc^2 x - cot^2 x=

1

(Csc x - cot x)(csc x+ cot x)=

1

cot^2 x - csc^2 x=

-1

(cot x- csc x)(cot x+csc x)=

-1

sin(A+B)=

(sin A)(cos B) + (sin B)(cos A)

sin(A-B)

(sin A)(cosB)-(Sin B)(Cos A)

cos(A+B)

(cos A)(cos B)- (sinA)(sinB)

cos(A-B)

(cos A)(cos B) + (sin A)(Sin B)

tan(A-B)

tan A - tan B/1+ (tan A)(tan B)t

tan(A+B)

tan A + tan B/ 1-(tan A)(tan B)

sin(2x)

2(sin x)(cos x)

cos(2x)

cos^2 x- sin^2 x

cos(2x)

2 cos^2 x-1

cos(2x)

1-2(sin^2 x)

tan(2x)

2(tan x)/1-tan^2 x