niche trig identities

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Last updated 12:18 PM on 5/21/26

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1

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cos²(x) =

(1+cos2(x))/2

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tan²(x) + 1 =

sec²(x)

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cos2x (in terms of cos x)

2cos²x - 1

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cos2x (in terms of sinx)

1-2sin²x

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1 + cot²=

cosec²

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