f(x)=a x^{2}+b x+c\lim _{h \rightarrow 0} \frac{f(x+h)-f(x)}{h}=2 a x+ – InterviewSolution

1.	f(x)=a x^{2}+b x+c\lim _{h \rightarrow 0} \frac{f(x+h)-f(x)}{h}=2 a x+b
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