Double Angle Identities
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Last updated 4:08 AM on 6/24/26
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5 Terms
1
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cos 2x
cos²x - sin²x
2
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cos 2x
2cos²x - 1
3
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cos 2x
1 - 2sin²x
4
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sin 2x
2sinx cosx
5
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tan 2x
2tanx
1 - tan²x