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let y= -x^3 + 6x^2 - 5 a. find all critical numbers for f(x). b. find...

let y= -x^3 + 6x^2 - 5
a. find all critical numbers for f(x).
b. find the absolute extrema on the interval (-1,3).
c. find the absolute extrema on the interval (1,3).
Math   Calculus   
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