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# p3 identities.... watch

1. Can sum1 confirm...for th p3 exam on wednesday (edexcel) are these the only identities you need to learn...ie. they not in the formulae book??

sin^2A + cos^A = 1
sec^2A= 1 + tan^2A
cosec^A = 1 +cot^A

Sin2A = 2SinACosA
Cos2A= Cos^A - sin^2 A = Cos^A - 1 = 1 - Sin^2A
Tan2A = 2TanA / 1 - Tan^2A

Sin1/2A = 1/2(1 - cosA)
Cos1/2A = 1/2(1 + cosA)

Are there any more or any that i dnt need 2 know?? Do i need to know sum-product formulae??
2. Edexcel's formula book can be found here. The sum-product formulae are given.

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