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Questions  >>  CBSE XII  >>  Math  >>  Relations and Functions
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Q)

If $y = 7x -x^3$ and $x$ increases at the rate of 4 units per second. How fast is the slope of the curve changing when $x=2$


$(A)\; 48$
$(B)\; -48$
$(C)\; 36$
$(D)\; -36$

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