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

Area of the region bounded by the curve $$y=\tan x$$, the $$X$$-axis and line $$x=\frac{\pi}{3}$$ is

The area of the region bounded by $$y=-\sqrt{16-x^2}$$ and $$X$$-axis is