1.

\[\int_{{}}^{{}}{{{x}^{51}}({{\tan }^{-1}}x+{{\cot }^{-1}}x)\ dx=}\] [MP PET 1991]

A.            \[\frac{{{x}^{52}}}{52}({{\tan }^{-1}}x+{{\cot }^{-1}}x)+c\]
B.            \[\frac{{{x}^{52}}}{52}({{\tan }^{-1}}x-{{\cot }^{-1}}x)+c\]
C.            \[\frac{\pi {{x}^{52}}}{104}+\frac{\pi }{2}+c\]
D.            \[\frac{{{x}^{52}}}{52}+\frac{\pi }{2}+c\]
Answer» B.            \[\frac{{{x}^{52}}}{52}({{\tan }^{-1}}x-{{\cot }^{-1}}x)+c\]


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