Question:
Mark $(\sqrt{)}$ against the correct answer in each of the following:
$\int \sqrt{9-4 x^{2}} d x=?$
A. $\frac{x}{2} \sqrt{9-4 x^{2}}+\frac{9}{4} \sin ^{-1} \frac{2 x}{3}+C$
B. $x \sqrt{9-4 x^{2}}+\frac{9}{2} \sin ^{-1} \frac{2 x}{3}+C$
C. $\frac{x}{2} \sqrt{9-4 x^{2}}-\frac{9}{4} \sin ^{-1} \frac{2 x}{3}+C$
D. none of these
Solution:
