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