Mark against the correct answer in each of the following:

Question:

Mark $(\sqrt{ })$ against the correct answer in each of the following:

$\int \frac{d x}{\left(x^{2}+4 x+8\right)}=?$

A. $\frac{1}{2} \tan ^{-1}\left(\frac{\mathrm{x}+1}{2}\right)+\mathrm{C}$

B. $\frac{1}{2} \tan ^{-1}\left(\frac{\mathrm{x}+2}{2}\right)+\mathrm{C}$

C. $\frac{1}{2} \tan ^{-1}(\mathrm{x}+2)+\mathrm{C}$

D. $\tan ^{-1}\left(\frac{\mathrm{x}+2}{2}\right)+\mathrm{C}$

Solution:

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