definite-integral

Question: The least value of the function $F(x)=$ $\int_{5\pi /4}^{x}{(3\sin u+4\cos u)\,du}$ on the interval $\left[ \frac{5\pi }{4},\,\,\frac{4\pi }{3} \right]$ is



1) $\sqrt{3}+\frac{3}{2}$
2) $-2\sqrt{3}+\frac{3}{2}+\frac{1}{\sqrt{2}}$
3) $\frac{3}{2}+\frac{1}{\sqrt{2}}$
4) None of these
Solution: Explanation: No Explanation
Summation of series by definite Integration

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