the graph of the function cosxcos(x+2)-cos^2(x+1)is

 

 

a) a straight line passing through (0, -sin^2 1) with slope 2

 

 

b) a straight line passing thru (0,0)

 

c) a parabola with vertex (0, -sin^2 1)

 

 

d) a straight line passing thru the point (pi/2, -sin^2 1) and parallel to x axis