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Multiply $2$ times $5$
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$derivdef\left(10+5\right)$
Learn how to solve definition of derivative problems step by step online. Find the derivative of 2*5+5 using the definition. Multiply 2 times 5. Add the values 10 and 5. Find the derivative of 15 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 15. Substituting f(x+h) and f(x) on the limit, we get. Subtract the values 15 and -15.