Homework Help: calculus please help me

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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