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(x)}{h}=\lim\limits_{h\to 0}3 = 3 $
Hence Verified.
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