If \( f^{\prime}(x)=\sqrt{2 x^{2}-1} \) and \( y=f\left(x^{2}\right...
If \( f^{\prime}(x)=\sqrt{2 x^{2}-1} \) and \( y=f\left(x^{2}\right) \), then \( \frac{d y}{d x} \) at \( x=1 \) is equal to
(1) 2
(2) 1
P
(3) \( -2 \)
(4) \( -1 \)
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