# mathamatics 10+1

prove that
cotxcot2x-cot2xcot3x-cot3xcotx=1

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1. I picked a random angle (20º) 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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