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Question

find the derivative of, x/2x+1 with respect to x from first principle.

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Solution

Let y = x2x+1y + y = x+x2x+x+1y = x+x2x+x+1 - x2x+1y = x+x2x+1-x2x+2x+12x+2x+12x+1y = 2x2+x+2xx+x-2x2-2xx-x2x+2x+12x+1y = x2x+2x+12x+1yx = 12x+2x+12x+1limx0yx = limx012x+2x+12x+1dydx = 12x+12

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