1.

\[\int_{{}}^{{}}{(3\,\text{cose}{{\text{c}}^{2}}x+2\sin 3x)\ dx=}\] [AI CBSE 1981]

A.            \[3\cot x+\frac{2}{3}\cos 3x+c\]      
B.            \[-\left( 3\cot x+\frac{2}{3}\cos 3x \right)+c\]
C.            \[3\cot x-\frac{2}{3}\cos 3x+c\]
D.            None of these
Answer» C.            \[3\cot x-\frac{2}{3}\cos 3x+c\]


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