Question
Find the area included between the two curves y2 = 9x and ,x2 = 9y. Also draw the rough sketch.
Solution
The equations of curves are
...(1)
and 
...(2)
From (1) and (2), we get
curves (1) and (2) intersect in O(0, 0), P(9, 9)
From P, draw 
x-axis.
Required area = Area OAPBO = Area OBPM - area OAPM
