CMR:
$cos\dfrac{8\pi }{35}+cos\dfrac{12\pi }{35}+cos\dfrac{18\pi }{35}=\dfrac{1}{2}cos\dfrac{\pi}{5}+\dfrac{\sqrt{7}}{2}sin\dfrac{\pi}{5}$
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Started By Momochan, 21-05-2011 - 11:07
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Posted 21-05-2011 - 11:07
Momochan
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