Solve the system of equations,
\[
\begin{array}{l}
\sin x \sin y=\sqrt{3} / 4 \\
\cos x \cos y=\...
Solve the system of equations,
\[
\begin{array}{l}
\sin x \sin y=\sqrt{3} / 4 \\
\cos x \cos y=\sqrt{3} / 4
\end{array}
\]
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