How prove that: $$-\tan[(\frac{10\pi}{41}+4[\sin[(\frac{2\pi}{41}+\sin[(\frac{4\pi}{41}+\sin[(\frac{12\pi}{41}+\sin[(\frac{20\pi}{41}-\sin[(\frac{26\pi}{41})]-\sin[(\frac{30\pi}{41})])])])])]])]=\cot[(\frac{2\pi}{41}-\cot[(\frac{8\pi}{41}+\cot[(\frac{20\pi}{41}+\cot[(\frac{32\pi}{41}+\cot[(\frac{36\pi}{41})])])])]$$
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Do you have this written somewhere else? – Aaron Maroja Sep 26 '14 at 21:26
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@DavidkK Question asked by the same user, but they are different: the one you point to is numerically true, whereas this one is not. – Jean-Claude Arbaut Sep 26 '14 at 21:40