Separate the interval `[0,\ pi//2]` into sub-intervals in which `f(x)=sin^4x+cos^4x` is increasing or decreasing.

Separate the interval [0,pi/2] into sub- intervals in which f(x)=s in^(4)x+cos^(4)x is increasing or decreasing.

Sparate the interval [0, pi/2] into sub-intervals in which f(x)=sin^(4) x+cos^(4) x is increasing

Sparate the interval [0, pi/2] into sub-intervals in which f(x)=sin^(4) x+cos^(4) x is decreasing

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

Find the intervals in which f(x)=x^4-4x is increasing or decreasing.

Find the intervals in which f(x)=x^4-4x^3+4x^2+15 is increasing or decreasing.

Find the intervals in which f(x)=x^(4)-4x is increasing or decreasing.

Separate the interval [0,pi/2] into sub intervals in which function f(x)=sin^4(x)+cos^4(x) is strictly increasing or decreasing.

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

Find the intervals in which f(x)=(4x^2+1)/x is increasing or decreasing.