Question

prove cot² - 1/sin = -1

Answer 1

cot^2 - 1/ sin^2 = -1

cos^2/ sin^2 - 1 / sin^2

(cos^2 - 1) / sin^2

1 - cos^2 = sin^2

-sin^2 / sin^2

= -1 =RHS


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Answer 2

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