Posted by **Robin** on Thursday, September 29, 2011 at 9:53pm.

If f(x)=(3x)/(1+x2) find f′(4)______.

Use this to find the equation of the tangent line to the curve y=(3x)/(1+x2) at the point (4,0.70588). The equation of this tangent line can be written in the form y=mx+b where m is: ________ and where b is:______

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