Trig Identities
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Last updated 9:05 PM on 5/11/26
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11 Terms
1
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sin²x + cos²x =
1
2
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1 + tan²x =
sec²x
3
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1 + cot²x =
csc²x
4
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tanx =
sinx / cosx
5
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cotx =
cosx / sinx
6
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secx =
1/cosx
7
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cscx=
1/sinx
8
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sin (a ± b) =
sina cosb ± cosa sinb
9
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cos (a ± b) =
cosa cosb -/+ sina sinb
10
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sin (2x) =
2 sinx cosx
11
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cos (2x) =
cos²x - sin²x