Half Angle and Double Angle Identities

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7 Terms

1
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sin(2x)

2sinxcosx

2
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cos(2x)

cos²x-sin²x

3
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cos(2x)

2cos²x-1

4
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cos(2x)

1-2sin²x

5
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tan(2x)

2tanx/1-tan²x

6
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sin(x/2)

+-√1-cosx/2

7
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cos(x/2)

+-√1+cosx/2