Question 1021876
{{{f(x)=x^4-2x^2}}}
{{{df/dx=4x^3-4x}}}
{{{df/dx=4x*(x^2-1)}}}
{{{df/dx=4x(x-1)(x+1)}}}
,
,
{{{x-1=0}}}
{{{x[c]=1}}}
.
.