1.

If value of ∫ \(\frac{2x}{(x^2+1)(x^2+3)}dx\) will be _______ where c is an arbitary constant.

A. \(\frac{1}{2}log\frac{x^2 +1}{x^2+3}+c\)
B. \(\frac{1}{2}log\frac{x^2 -1}{x^2+1}+c\)
C. \(2log\frac{x +1}{x-3}+c\)
D. \(2log\frac{2x +1}{2x-1}+c\)
Answer» B. \(\frac{1}{2}log\frac{x^2 -1}{x^2+1}+c\)


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