Question

Find the area of the region enclosed by the curve y = cos x , X-axis and the lines x = 0 and x = $\frac{\pi }{2}$

Answer 1

$\begin{array}{c}Area={\int }_0^{\frac{\pi }{2}}\cos x\\ ={\left[\sin x\right]}_0^{\frac{\pi }{2}}\\ =1\end{array}$