Answer
Verified
Work Step by Step
$\frac{df}{dx}=\lim\limits_{h\to 0}\frac{f(x+h)-f(x)}{h}$
$=\lim\limits_{h\to 0}\frac{3(x+h)^3-3x^3}{h}=\lim\limits_{h\to 0}\frac{3h^3+3xh(x+h)}{h} = 0+3x^2+0=3x^2$
Hence Verified.
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