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Bài tập CALCULUS 85
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Created by T. Madas
Question 282
(*****)
y=x
y
y = x2 + x − 1
B
O
x
A
The figure above shows the graph of the curve C with equation
y = x2 + x −1 ,
intersected by the straight line L with equation
y = x.
The points A and B , are the points of intersection between C and L ,as shown in the
above figure. The finite region R is bounded by C and L .
Show that the area of R , shown shaded in the above figure, is 4 .
3
proof
Created by T. Madas
Created by T. Madas
Question 283
(*****)
A solid right circular cylinder is to be cut out of a solid right circular cone, whose
radius is 1.5 m and its height is 3 m .
The axis of symmetry of the cone coincides with the axis of symmetry of the cylinder
which passes though its circular ends. The circumference of one end of the cylinder is
in contact with the curved surface of the cone and the other end of the cylinder lies on
the base of the cone.
Show that the maximum volume of the cylinder to be cut out is π m3 .
C2S , proof
Created by T. Madas
Created by T. Madas
Question 284
(*****)
y
y = 1 + 2 x − x2
L
A
x
O
B
The diagram above shows part of the curve C , with equation
y = 1 + 2x − x2 .
The curve crosses the y axis at the point A .
The straight line L is the normal to C at A .
The point B is a point of intersection between C and A .
Find the exact area of the finite region, bounded by C and L .
C2S , area = 125
48
Created by T. Madas
