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Constant derivative rule/Proof

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\frac{d}{dx}a=0, for some constant a.

PrerequisitesEdit

The limit definition of the derivative, f'(x)=\lim_{h \to 0}\frac{f(x+h)-f(x)}{h}

ProofEdit

Let f(x) = a for some constant a. From the limit definition of the derivative:

f'(x)=\lim_{h \to 0}\frac{f(x+h)-f(x)}{h}
f'(x)=\lim_{h \to 0}\frac{a-a}{h}
f'(x)=0

QED

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