Find the intervals in which the function f given by `f(x)=sin x + cos x(0 le x le 2 pi)` is increasing

Find the intervals in which the function f given by f(x)=sin x + cos x(0 le x le 2 pi) is decreasing

Find the intervals in which the function given by f(x)=sin x+cos x, 0le x le 2pi is strictly increasing.

Find the intervals in which the function f given by f(x) =sin x +cos x , 0lt=x lt=2pi is increasing or decreasing.

Find the intervals in which the function f given by f(x) =sin x +cos x , lt=x lt=2pi is increasing or decreasing.

Find the intervals in which the function 'f' given by: f(x) = sin x-cosx , 0 le x le 2pi is strictly increasing or decreasing.

Find the intervals in which the function given by : f (x) = sin x + cos x , 0 le x le 2pi . is strictly increasing and strictly decreasing.

Find the intervals in which the function f given by f(x)=(4sin x-2x-x cos x)/(2+cos x) is increasing decreasing,x in(0,2 pi)