Trignometric Identities

The ones that aren't given in the formula book

Sin2A

2SinACosA

Cos2A

Cos²A - Sin²A

or

2Cos²A - 1

or

1 - 2sin²A

Tan2A

(2TanA)

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(1 - Tan²A)

Sin²x + Cos²x =

1

Sec²x =

Tan²x + 1

Cosec²x =

1 + Cot²x