When x = pi, the value of y is y = 0. This is one of the infinitely many x intercepts. So the point (pi,0) is on the curve.
When x = 3pi/2, the value of y is y = -3. The point (3pi/2, -3) is another point on this curve. This point is a local and absolute minimum.
Find the slope of the line going through these two points (x1,y1) = (pi,0) (x2,y2) = (3pi/2,-3)
Slope Formula: m = (y2-y1)/(x2-x1) m = (-3-0)/(3pi/2-pi) m = (-3)/(3pi/2-2pi/2) m = (-3)/(pi/2) m = (-3/1)/(pi/2) m = (-3/1)*(2/pi) m = (-3*2)/(1*pi) m = -6/pi
The slope of the line through the two points is -6/pi This means that the average rate of change from x = pi to x = 3pi/2 is -6/pi
