結果 : is csc^2 x-1=cot^2x an identity
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prove (1 + cot^2(x) = csc^2(x)

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Trigonometry Identity: 1 + cot^2(x) = csc^2(x)

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(csc x - 1)(csc x + 1) = cot^2 x

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Algebra Help and Trigonometry Help: (cot^2⁡x-1)/(1+cot^2⁡x )=1-2 sin^2⁡x - Prove

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