definite-integral

Question: $\int_{0}^{\pi /2}{{{\cos }^{2}}x\,dx=}$



1) $1-\frac{\pi }{4}$
2) $1+\frac{\pi }{4}$
3) $\frac{\pi }{4}$
4) $\frac{\pi }{2}$
Solution: Explanation: No Explanation
Summation of series by definite Integration

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