\[ \cos 3 A+\cos 5 A+\cos 7 A+\cos 15 A= \] \( \mathrm{P} \) \[ 4 \...

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\[
\cos 3 A+\cos 5 A+\cos 7 A+\cos 15 A=
\]
\( \mathrm{P} \)
\[
4 \cos 4 A \cos 5 A \cos 6 A
\]
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