The first identities we learned about was the Pythagorean Identities.

Another identity type would be the even/odd identities.

Cosine is an Even Function, so cos(x) = cos(-x)

Sine is an Odd Function, so sin(x) = -sin(x)

Tangent is an Odd Function, so tan(x) = -tan(x)

The sums and difference identities has its own rap.

The rap for sin is "Sin, Sin, Cos, Cos, Sin.

The rap for cos is "Cos, Cos, Cos, BUST-A-MOVE, Sin, Sin

It goes Sin(a+b)=(sina)(cosb)+(cosa)(sinb)

It goes Cos(a+b)=(cosa)(cosb) - (sina)(sinb)

I think i have most of this stuff down, so I'm gonna go off to study and/or sleep (most likely sleep). Good Luck on the test tomorrow.

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