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User talk:Scientest

Revision as of 20:03, 25 July 2013 by Scientest (talk | contribs)

Well? Do some math!

Prove: $c^2=a^2+b^2-2ab\cdot \cos (C)$ for some sides of a triangle $a, b,$ and $c$, and $C$ being the largest angle of a triangle.

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