Double Angle and Half Angle Identities

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6 Terms

1
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2 sinx cosx

sin2x

2
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cos²x - sin²x

2cos²x - 1

1 - 2sin²x

cos2x

3
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\frac{2\tan x}{1-\tan^2x}

tan2x

4
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(1 - cos2x) / 2

sin²x

5
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(1 + cos2x) / 2

cos²x

6
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(1 - cos2x) / (1 + cos2x)

tan²x