सिद्ध कीजिए कि \[ \cos 5 A=16 \cos ^{5} A-20 \cos ^{3} A+5 \cos A \]

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सिद्ध कीजिए कि
\[
\cos 5 A=16 \cos ^{5} A-20 \cos ^{3} A+5 \cos A
\]
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