Question: Need help with these math problems. Find the intervals on which f is increasing and decreasing: f(x)=3cos(3x) on [-pi, pi], f(x)=-4cos^2x on [-pi, pi], f(x)=-12x^5

Need help with these math problems.

Find the intervals on which f is increasing and decreasing:

f(x)=3cos(3x) on [-pi, pi], f(x)=-4cos^2x on [-pi, pi], f(x)=-12x^5 + 135x^4 - 400x^3, f(x)=2x^2 - 36lnx

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