Find the intervals in which `f(x)=sin3x-cos3x ,\ \ 0

Find the intervals in which f(x) = sin x - cos x , 0 lt x lt 2pi , is strictly increasing or strictly decreasing.

Find the intervals in which : f(x) sin 3x - cos 3x, 0 < x < pi , is strictly increasing or strictly decreasign.

Find the intervals in which f(x)=sin x-cos x, where ' 0

Find the intervals in which f(x) = sin x - cos x , where 0 < x< 2pi , is strictly increasing or decreasing.

Find the intervals in which f(x) = sin x - cos x , "where "0 lt x lt 2 pi is decreasing

Find the intervals in which f(x) = sin 3x – Cos 3x, 0 < x < pi , is strictly increasing or decreasing.

Find the intervals in which f(x) = sin 3x, x in [0,pi/2] is (i) increasing, (ii) decreasing.

Find the intervals in which f(x) = sin 3x, x in [0,pi/2] is (i) increasing, (ii) decreasing.

Find the in intervals in which f(x)=sin^(4)x+cos^(4)x is increasing or decreasing x in (0, (pi)/(2)) .

Find the intervals in which function f(x) = sin x-cos x, 0 lt x lt 2pi is (i) increasing, (ii) decreasing.