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OpenStudy (anonymous):
how do you verify cos(180 + x) = -cos(x)?
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OpenStudy (watchmath):
You may use the formula \(cos(a+b)=\cos a\cos b-\sin a\sin b\). So \(cos(180+x)=\cos(180)\cos x -\sin(180)\sin x=(-1)\cos x - 0=-\cos x\)
OpenStudy (anonymous):
Thank you
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