सिद्ध कीजिए कि \[ \cos 2 \theta \cdot \cos 2 \phi+\sin ^{2}(\theta-\phi)-\sin ^{2}(\theta+\phi)=...
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सिद्ध कीजिए कि
\[
\cos 2 \theta \cdot \cos 2 \phi+\sin ^{2}(\theta-\phi)-\sin ^{2}(\theta+\phi)=\cos (2 \theta+2 \phi)
\]
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