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Find the points of local maxima and loca...

Find the points of local maxima and local minima, if any, `y = 3x^3+12x^2+7`. Find also the local maximum and local minimum values, as the case may be:

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RD SHARMA ENGLISH-MAXIMA AND MINIMA-All Questions
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  12. Find all the points of local maxima and minima and the corresponding...

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  18. Find the maximum and the minimum values, if any, of the following f...

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  20. Find the maximum and the minimum values, if any, of the following f...

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