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Subtract the values $45$ and $-20$
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$derivdef\left(25\right)$
Learn how to solve problems step by step online. Find the derivative of 45-20 using the definition. Subtract the values 45 and -20. Find the derivative of 25 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 25. Substituting f(x+h) and f(x) on the limit, we get. Subtract the values 25 and -25. Zero divided by anything is equal to zero.