Trig Identities- Half angle reduction formulas

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4 Terms

1
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cos²(x) (power reduction half-angle identity)

1+cos(2x)/2

2
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2cos²(x)

1+cos(2x)

3
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sin²(x) (power reduction half-angle identity)

1-cos(2x)/2

4
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2sin²(x)

1-cos(2x)