Find all the points of local maxima and minima and the corresponding maximum and minimum values of the function `f(x)=2x^3-21 x^2+36 x-20` .
Find all the points of local maxima and minima and the corresponding maximum and minimum values of the function `f(x)=2x^3-21 x^2+36 x-20` .
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Correct Answer - local max. value is `-3` at x = 1 and local min. value is `-128 " at " x = 6`
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