Posted by **Leslie** on Wednesday, May 7, 2008 at 5:22pm.

Let f(x)=9sinx/2sinx+4cosx.

Then 'f(x)= ((2sinx+4cosx)(9cosx)-(9sinx)(2cosx-4sinx))/(2sinx+4cosx)^2.

The equation of the tangent line to y=f(x) at a=2 can be written in the form y=mx+b where

m= 9and

b= ______.?????

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