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29 September, 21:48

How do you find the derivative of y=√x using the definition of derivative?

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  1. 29 September, 22:12
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    Lim (√ (x+h) - √x) / h)) * (√ (x+h) + √x)) / (√ (x+h) + √x)) rationaize = (x+h-x) / (h * (√ (x+h) + √x)) = 1 / (√ (x+h) + √x)) replacing h=0 from the lim you get = 1 / (√x+√x) = 1 / (2√x)
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