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Precalculus: Basic Identities

Terms

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Cos(x-y)=
CosXCosY+SinXSinY
CosXCosY-SinXSiny=
Cos(X+Y)
Sin(X-Y)=
SinXCosY-SinYCosX
SinXCosY+SinYCosX=
Sin(X+Y)
Tan(X-Y)=
(TanX-TanY)/(1+TanXTanY)
(TanX+TanY) Divided by (1-TanXTanY)=
Tan(X+Y)
Cos(2X)=
Cos squared X-Sin squared X
2SinXCosX=
Sin(2X)
Tan 2X=
(2TanX)/(1-Tan squared x)
The square root of (1+Cos X)/(2)=
Cos (X/2)
Sin (X/2)
The square root of (1-Cos X)/2
Tan(X/2)
Sqaure root of (1-CosX)/(1+Cos X)

Deck Info

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