Trigonometric Double and Half Angle Identities
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Last updated 12:11 PM on 9/14/23
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10 Terms
1
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sin2x
2sinxcosx
2
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cos2x (sin & cos)
cos²x-sin²x
3
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cos2x (cos)
2cos²x-1
4
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cos2x (sin)
1-2sin²x
5
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tan2x
2tanx/(1-tan²x)
6
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cos(x/2)
±√(1+cosx)/2
7
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sin(x/2)
±√(1-cosx)/2
8
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tan(x/2) (cos sqrt)
±√(1-cosx)/(1+cosx)
9
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tan(x/2) (sin cos)
sinx/(1+cosx)
10
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tan(x/2) (cos sin)
(1-cosx)/sinx
