MCQ
$\int_{}^{} {(3\,{\rm{cose}}{{\rm{c}}^2}x + 2\sin 3x)\;dx = } $
- A$3\cot x + \frac{2}{3}\cos 3x + c$
- ✓$ - \left( {3\cot x + \frac{2}{3}\cos 3x} \right) + c$
- C$3\cot x - \frac{2}{3}\cos 3x + c$
- DNone of these
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$f(x)= \begin{cases}\operatorname{a} \sin \frac{\pi}{2}(x-1), & \text { for } x \leq 0 \\ \frac{\tan 2 x-\sin 2 x}{b x^{3}}, & \text { for } x>0\end{cases}$
If $f$ is continuous at $x=0$, then $10-a b$ is equal to ...... .