Posted by **edward** on Friday, July 26, 2013 at 11:40pm.

prove that 4cos36+cot15/2=1+4+9+16+25+36,ifcot15/2 is1+cos15/+sin15

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**Steve**, Saturday, July 27, 2013 at 12:04am
Aside from the carelessness with parentheses, the statement as written is obviously preposterous, since cos(x) < 1 for any x, and cot(15/2) < 8.

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