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OpenStudy (anonymous):
2sinAsinB=cos(A-B)-cos(A+B)
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OpenStudy (mertsj):
\[\cos (A-B)-\cos (A+B)=\] \[\cos A \cos B+\sin A \sin B-(\cos A \cos B-\sin A \sin B)\]
OpenStudy (mertsj):
You can finish it
OpenStudy (anonymous):
2sinAsinB ?
OpenStudy (mertsj):
What were you supposed to show that it is equal to?
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