Question:
Mark $(\sqrt{)}$ against the correct answer in each of the following:
$\int \tan ^{2} \frac{\mathrm{x}}{2} \mathrm{dx}=?$
A. $\tan \frac{x}{2}-x+C$
B. $\tan \frac{x}{2}+x+C$
C. $2 \tan \frac{x}{2}+x+C$
D. $2 \tan \frac{x}{2}-x+C$
Solution:
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