The function $f(x)=\tan x-x$

The length of a rectangle is five times the breadth. If the minimum perimeter of the rectangle is 180 cm , then

The value of $C$ in $(0,2)$ satisfying the mean value theorem for the function $f(x)=x(x-1)^2, x \in[0,2]$ is equal to

For the function $f(x)=x^3-6 x^2+12 x-3$; $x=2$ is