Key(^) points
P1^
6
4 Area B =∫a((fgxx)– ())dx
b
5 Area C =∫pxy
q
d
6 Volumes of revolution
About the x axis V = (^) ∫
b
a
πy^2 dx
About the y axis V = (^) ∫
q
p
πx^2 dy
y
b x
B
a
y = f (x)
y = g (x)
C
q
p
y
O x
y = f (x)
a b x
y
q
x
y
p