1.

\[\int{\sqrt{\frac{1+x}{1-x}}\,\,dx=}\]                   [RPET 2002]

A.            \[-{{\sin }^{-1}}x-\sqrt{1-{{x}^{2}}}\,+c\]
B.            \[{{\sin }^{-1}}x+\sqrt{1-{{x}^{2}}}\,+c\]
C.            \[{{\sin }^{-1}}x-\sqrt{1-{{x}^{2}}}\,+c\]
D.            \[-{{\sin }^{-1}}x-\sqrt{{{x}^{2}}-1}\,+c\]
Answer» D.            \[-{{\sin }^{-1}}x-\sqrt{{{x}^{2}}-1}\,+c\]


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