Find the number of points of local extrema of `f(x)=3x^4-4x^3+6x^2+ax+b` where `a,b in R`

Find the local extrema of the function f(x) = 3x^(4) - 4x^(3)

Find the points of local extrema of the function f(x)=x^3-9x^2-48x+6AAx in R . Also find its local extrema.

Find the points of inflection for (a) f(x)=sinx (b) f(x)=3x^4-4x^3

Find the points of inflection for (a) f(x)=sinx (b) f(x)=3x^4-4x^3

Find the local extrema of the function f(x)=4x^(6)-6x^(4)

Find the extrema points of f(x)=3x^(4)-4x^(3)-36x^(2)+28

Find the extrema points of f(x)=3x^(4)-4x^(3)-36x^(2)+28

Find the points of local extrema for the function f(x) = cos4x defined on [0,pi/2]