Question:
Mark $(\sqrt{ })$ against the correct answer in each of the following:
$\int \cos 3 x d x=?$
A. $-\frac{1}{3} \sin 3 x+C$
B. $\frac{1}{3} \sin 3 x+C$
C. $3 \sin 3 x+C$
D. $-3 \sin 3 x+c$
Solution:
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