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kogti [31]
3 years ago
15

PLEASE HELP Trig Idenities

Mathematics
1 answer:
kari74 [83]3 years ago
4 0
\dfrac{\sin(A+B)}{\sin(A-B)}=\dfrac{\sin A\cos B+\cos A\sin B}{\sin A\cos B-\cos A\sin B}

Divide through all terms by \cos A\cos B. Then, for instance, the first term in the numerator becomes

\dfrac{\sin A\cos B}{\cos A\cos B}=\dfrac{\sin A}{\cos A}=\tan A

All other terms reduce similarly, giving the final product

\dfrac{\tan A+\tan B}{\tan A-\tan B}
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