\[
\begin{array}{l}
x=\sin \left[\sin ^{-1}(3 / 5)+\sin ^{-1}(8 / 1...
\[
\begin{array}{l}
x=\sin \left[\sin ^{-1}(3 / 5)+\sin ^{-1}(8 / 17)\right] \\
y=\cos \left[\cos ^{-1}(4 / 5)+\cos ^{-1}(12 / 13)\right]
\end{array}
\]
then the value of \( \frac{2541}{x y} \) is equal to \( 221 \lambda^{2}, \lambda= \)
\( \mathrm{W} \)
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