Question
Draw a rough sketch of the curves y = sin x and y = cos x as x varies from 0 to 
and find the area of the region enclosed by them and the x-axis.
Solution
Let OB and CA represent the curves y = sin x and y = cos x as x varies from 0 to 
. The two curves intersect at D where
Required area = Area OAB + area OCA - area ODA
