Write the derivative of (x - 4)/(4 + x) with respect to x?

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8/square of (x+4).
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A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is : A.1/4 B.1/10 C.7/15 D.8/15
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