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OpenStudy (anonymous):
Question in the comments Please help
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OpenStudy (anonymous):
|dw:1453342392056:dw| It asks for words in the proof behind this diagram and these equations as a a proof for the law of cosines, \[(2a \cos x-b)b=(a-c)(a+c)\] Translates into \[c^2=a^2+b^2-2ab \cos x\]
OpenStudy (anonymous):
What I really need help with is how in the first equation the one side equals the other because I need to give a proper explanation, I can do the math by myself
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