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
Solution :
It is formula.
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