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Multiply $10$ times $9$
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$derivdef\left(90\right)$
Learn how to solve definition of derivative problems step by step online. Find the derivative of 10*9 using the definition. Multiply 10 times 9. Find the derivative of 90 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 90. Substituting f(x+h) and f(x) on the limit, we get. Subtract the values 90 and -90. Zero divided by anything is equal to zero.