Question:
The function $f(x)=\frac{4 x^{3}-3 x^{2}}{6}-2 \sin x+(2 x-1) \cos x:$
Correct Option: 1,
Solution:
$f^{\prime}(x)=(2 x-1)(x-\sin x)$
$\Rightarrow f^{\prime}(x) \geq 0$ in $x \in\left[\frac{1}{2}, \infty\right)$
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