If \( \left(\sin ^{-1} x\right)^{2}+\left(\cos ^{-1} x\right)^{2}=\frac{5 \pi^{2}}{8} \), then \...

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If \( \left(\sin ^{-1} x\right)^{2}+\left(\cos ^{-1} x\right)^{2}=\frac{5 \pi^{2}}{8} \), then \( x \) equals:
(a) \( \frac{-1}{\sqrt{2}} \)
(b) 1
(c) 0
(d) None of these
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