Find the value of \( \cos 2 a \) when \( \cos \alpha=\frac{15}{17} \), \[ \sin a=\frac{4}{5} \]
Find the value of \( \cos 2 a \) when \( \cos \alpha=\frac{15}{17} \),
\[
\sin a=\frac{4}{5}
\]
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