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Find the derivative of the constant func...

Find the derivative of the constant function `f(x) = a` for a fixed real number `a`.

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We have. `f^(.)(x) = lim_(h rarr 0) (f(x+h)-f(x))/h = lim_(h rarr 0)(a-a)/h = lim_(h rarr 0) 0/h = 0 as h ne 0`
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