. Area of the region bounded by $y=\cos x, x=0$, $x=\pi$ and $X$-axis is ... sq. units.

The area of the region enclosed between pair of the lines $x y=0$ and the lines $x y+5 x-4 y-20=0$, is .............

The area of the region bounded by the curve $y=2 x-x^2$ and the line $y=x$ is ........... units. square