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Find the derivative of y=x^2 using the f...

Find the derivative of `y=x^2` using the first principle.

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We have, `f^(.)(x) = lim_(h rarr 0) (f(x+h)-f(x))/h = lim_(h rarr 0) ((x+h)^(2)-(x)^(2))/h = lim_(h rarr 0) (h +2x)=2x`
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