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31 August, 11:04

Prove, cotx - tanx = 2 cot2x

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  1. 31 August, 11:10
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    Step-by-step explanation:

    cotx - tanx = 2cot2x

    L. H. S

    cosx/sinx - sinx/cosx

    (cos²x - sin²x) / sinxcosx

    [ cos²x - (1-cos²x) ]/sinxcosx

    (2cos²x-1) / sinxcosx

    2cosx / 2sinxcosx

    2cot2x
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