half angle and double angle identities

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5 Terms

1
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2sinxcosx

sin(2x)

2
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cos²x-sin²x; 1-2sin²x; 2cos²x-1

cos(2x)

3
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±√(1-cosx)/2

sin(x/2)

4
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±√(1+cosx)/2

cos(x/2)

5
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sinx/(cosx+1)

tan(x/2)