?Evaluate the integral.\(\int_{0}^{\pi} f(x) d x\) where \(f(x)= \begin{cases}\sin x &
Chapter 4, Problem 53(choose chapter or problem)
Evaluate the integral.
\(\int_{0}^{\pi} f(x) d x\) where \(f(x)= \begin{cases}\sin x & \text { if } 0 \leqslant x<\pi / 2 \\ \cos x & \text { if } \pi / 2 \leqslant x \leqslant \pi\end{cases}\)
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