Trig Identies APPC
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Last updated 6:26 PM on 3/27/26
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7 Terms
1
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sin² x + cos² x =
1
2
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sec²x =
1 + tan²x
3
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csc²x =
1 + cot²x
4
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sin (2x) =
2 sin x cos x
5
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cos(2x) =
cos²x-sin²x
6
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cos(2x) =
1 - 2 sin²x
7
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cos(2x)
2 cos²x - 1
