If \( \left(\sin ^{-1} x\right)^{2}-\left(\cos ^{-1} x\right)^{2}=a \pi^{2} \) then the range of...
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0If \( \left(\sin ^{-1} x\right)^{2}-\left(\cos ^{-1} x\right)^{2}=a \pi^{2} \) then the range of ' \( a \) ' is
(A) \( \left[-\frac{3}{4}, \frac{1}{4}\right] \)
(B) \( [-1,1] \)
(C) \( \left[-\frac{3}{4}, \frac{3}{4}\right] \)
(D) \( \left[-1, \frac{3}{4}\right] \)
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