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I need to find f'(x) of f(x) = 1/sqrt(x-3) using the formal definition. I set the equation up as:

f'(x) = lim ((1/ sqrt(x + h -3)) - (1/sqrt(x-3)))/h and I am not sure what the next step is...

f'(x) = lim ((1/ sqrt(x + h -3)) - (1/sqrt(x-3)))/h and I am not sure what the next step is...

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