Question 1175371
<pre>
The formula in words is:
<font color="red"><b>

(The bottom) times (the derivative of the top)

minus

(The top) times (the derivative of the bottom)

all over

(The bottom squared)</font></b>

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{{{d/dx}}}{{{((x+y)/(x-y))}}}{{{""=""}}}{{{((x-y)(1+dy/dx)-(x+y)(1-dy/dx))/(x-y)^2}}}

Edwin</pre>