\[ \begin{array}{l} \cos \left(36^{\circ}-A\right) \cos \left(36^{\...

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\[
\begin{array}{l}
\cos \left(36^{\circ}-A\right) \cos \left(36^{\circ}+A\right)+\cos \left(54^{\circ}+A\right) \\
\cos \left(54^{\circ}-A\right)=\cos 2 A
\end{array}
\]
\( \mathrm{P} \)
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