Posted by **kwack** on Friday, August 20, 2010 at 8:58pm.

Find the equation of the tangent line to the curve y=5xcosx at the point (pi,–5pi).

The equation of this tangent line can be written in the form y=mx+b where

m=

and b=

- math -
**bobpursley**, Friday, August 20, 2010 at 9:23pm
y=5x cos x

y'=slope m= 5cosx-5xsinx at x=pi

y'=m=-5

line equation: y= -5x+b

now to find b, you know the point(PI,-5PI) is on it, so

-5pi--5PI+b so b=0

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