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Find all the points of local maxima and local minima of the function f given by `f(x)=2x^3-6x^2+6x+5`.

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`f(x)=2x^3-6x^2+6x+5`
`f'(x)=6x^2-12x+6=6(x-1)^2`
Put f'(x)=0 `implies 6(x-1)^2=0
implies x=1` ...
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