f(x)=2x²-x^4
f'(x) =4x-4x³
4x-4x³=0
4x(1-x²)=0
x1=0 1-x²=0
x=±1
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f(x)=2x²-x^4
f'(x) =4x-4x³
4x-4x³=0
4x(1-x²)=0
x1=0 1-x²=0
x=±1