\( \triangle A B C \) में सिद्ध कीजिए कि- \( \cos 4 A+\cos 4 B+\cos 4 C=-1+4 \cos 2 A \cos \) \(...

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\( \triangle A B C \) में सिद्ध कीजिए कि-
\( \cos 4 A+\cos 4 B+\cos 4 C=-1+4 \cos 2 A \cos \)
\( 2 B \cos 2 C \)
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