mathamatics 10+1

prove that
cotxcot2x-cot2xcot3x-cot3xcotx=1

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  1. I picked a random angle (20ยบ) and tested your "identity".
    the left side was equal to 1

    when you typed
    cotxcot2x ...
    did you mean
    cotxcot(2x)... or cotxcot2x ... ?

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    posted by Reiny

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