IDENTITIES AND EQUATIONS TRIG PRECALC

PRECALC

Sin(2x)

Sin(2x)

2sinxcosx

Cos(2x)

Cos2x - Sin2x

Tan(2x)

2Tanx / 1 - Tan2x

Sin(x+y)

SinxCosy + CosxSiny

Sin(x-y)

SinxCosy - CosxSiny

Cos(x+y)

CosxCosy - SinxSiny

Cos(x-y)

CosxCosy + SinxSiny

tan(x+y)

Tanx + Tany / 1 - TanxTany

Tan(x-y)

Tanx - Tany / 1 + TanxTany

sin(x/2)

+- root( 1 - cosx / 2)

cos(x/2)

+- root( 1 + cosx / 2)

Tan(x/2)

1 - cosx / sinx OR sinx / 1 + cosx