Question:
Mark $(\sqrt{ })$ against the correct answer in each of the following:
$\int \frac{d x}{\sqrt{x^{2}+6 x+5}}=?$
A. $\log \left|x+\sqrt{x^{2}+6 x+5}\right|+C$
B. $\log \left|x-\sqrt{x^{2}+6 x+5}\right|+C$
C. $\log \left|(x+3)+\sqrt{x^{2}+6 x+5}\right|+C$
D. none of these
Solution:
