Trigonometric Identities
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Last updated 8:18 PM on 8/31/25
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6 Terms
1
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cos2(x) + sin2(x) =
1
2
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cos2(x) =
(1/2)[1 + cos(2x)]
3
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sin2(x) =
(1/2)[1 - cos(2x)]
4
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sec2(x) =
tan2(x) + 1
5
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tan2(x) =
sec2(x) - 1
6
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sin(2x) =
2cos(x)sin(x)
Note 
Flashcards (57)