Answer
0
Work Step by Step
$f'(x)=\lim\limits_{h \to 0}\frac{f(x+h)-f(x)}{h}=\lim\limits_{h \to 0}\frac{12-12}{h}=\lim\limits_{h \to 0}\frac{0}{h}=0$ (as h$\ne$0)
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