Trigonometry Identities
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Last updated 7:13 PM on 3/13/26
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12 Terms
1
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sin²x+cos²x =
1
2
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tan²x+1 =
sec²x
3
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cot²x+1 =
csc²x
4
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sin2x = 2sinxcosx
5
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cos2x =
2cos²x-1
cos²x-sin²x
1-2sin²x
6
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tan2x =
(2tanx)/(1-tan²x)
7
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csc2x=
1/(sin2x)
8
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cot2x=
1/tan2x
9
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sec2x=
1/cos2x
10
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sin(u±v)=
sinucosv ± cosusinv
11
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cos(u±v) =
cosucosv±sinusinv
12
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tan(a±b) =
(tana ± tanb) / (1 ± tanatanb)
