The area of the region bounded by the line $y=3 x$ and the curve $y=x^2$ sq units is

The area of the region bounded by the line $y=x$ and the curve $y=x^3$ is

In the interval $$(0, \pi / 2)$$ area lying between the curves $$y=\tan x$$ and $$y=\cot x$$ and the $$X$$-axis is

The area of the region bounded by the line $$y=x+1$$ and the lines $$x=3$$ and $$x=5$$ is