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OpenStudy (anonymous):
cos (pi-x)= -cosx
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zepdrix (zepdrix):
One fun approach is to use your Angle Addition Formula for Cosine:\[\Large\rm \cos(a-b)=\cos a \cos b+\sin a \sin b\]
zepdrix (zepdrix):
\[\Large\rm \cos(\pi-x)=\cos \pi \cos x+ \sin \pi \sin x\]Something like that, yes? :d Understand how to simplify?
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