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29 August, 02:25

Verify the identity.

tan (x + (pi/2)) = - cot x

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  1. 29 August, 06:12
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    Tan (x + π/2) = [sin (x + π/2) / cos (x + π/2) ] = [sin x cos π/2 + sin π/2 cos x] / [cos x cos π/2 - sin x sin π/2] = cos x / - sin x = - cot x
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