1.

The value of \(\smallint \frac{1}{{\left( {x + 1} \right)\sqrt {{x^2} - 1} }}dx\) will be ______, where C is an arbitrary constant.

A. \(\sqrt {\frac{{{x^2} + 1}}{{{x^2} - 1}} + C} \)
B. \(\sqrt {\frac{{{x} - 1}}{{{x} + 1}}} + C\)
C. \(log {\frac{{{x} + 1}}{{{x} - 1}} + C} \)
D. \(log {\frac{{{x^2} - 1}}{{{x^2}+ 1}} + C} \)
Answer» C. \(log {\frac{{{x} + 1}}{{{x} - 1}} + C} \)


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