सिद्ध कीजिए कि-
\[
\begin{array}{r}
\sin (A+B) \cos (A-B)-\cos (A+B) \sin (A-B) \\
=\sin 2 B
\en...
सिद्ध कीजिए कि-
\[
\begin{array}{r}
\sin (A+B) \cos (A-B)-\cos (A+B) \sin (A-B) \\
=\sin 2 B
\end{array}
\]
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