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Multiply $1$ times $639$
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$derivdef\left(30+\frac{639}{10}\right)$
Learn how to solve definition of derivative problems step by step online. Find the derivative of 30+(1*639)/10 using the definition. Multiply 1 times 639. Divide 639 by 10. Add the values 30 and 63.9. Find the derivative of 93.9 using the definition. Apply the definition of the derivative: \displaystyle f'(x)=\lim_{h\to0}\frac{f(x+h)-f(x)}{h}. The function f(x) is the function we want to differentiate, which is 93.9. Substituting f(x+h) and f(x) on the limit, we get.