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OpenStudy (anonymous):
let f(x)=2x^4-4x^2. find all c in the interval (-3, 3) such that f'(c)=0 please show all steps
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OpenStudy (mathmate):
f(x)=2x^4-4x^2 f'(x)=8x^3-8x=8x(x^2-1) f'(x)=0 for x=0,x=+/-1 => c=-1,0 or 1
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