Posted by Julie on Friday, April 20, 2012 at 2:58pm.
first find the slope at x = pi
dy/dx = 1 + cos x = 1+cos pi = 1-1 = 0
so the line is horizontal
at x = pi
y = pi + sin pi = pi + 0 = pi
so the equation of our line is
y = pi
Thank you Damon!