Double-Angle Formulas
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Last updated 6:17 PM on 8/11/26
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5 Terms
1
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sin2θ
2sinθcosθ
2
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cos2θ
cos²θ-sin²θ
3
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cos2θ
2cos²θ-1
4
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cos2θ
1-2sin²θ
5
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tan2θ
(2tan)/(1-tan²θ)