[RPET 1995]
A) $ \frac{1}{x\sqrt{1-x^{2}}} $
B) $ -\frac{1}{x\sqrt{1-x^{2}}} $
C) $ \frac{1}{x\sqrt{x^{2}-1}} $
D) $ \frac{-1}{x\sqrt{x^{2}-1}} $
Correct Answer: C
It is formula.
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