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Find the slope of the tangent to the cur...

Find the slope of the tangent to the curve `y= 3x^4-4x` at `x=4`.

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`(dy)/dx=3xx4x^3-4xx1=12x^3-4therefore` Slope of the tangent at `=4=(dy)/dx|_("at"x=4)=12xx4^3-4=764`
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