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If y=x^(3)-12x^(2)+45x-13,then values of...

If `y=x^(3)-12x^(2)+45x-13`,then values of `x` at which rate of change of `y` with respect to `x` is zero are
(a) `3,5`
(b) `3,-5`
(c) `-3,5`
(d) `-3,-5`

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