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Unit 4: Definite Integral
2 Notes
(log 2)(2) (log1)(1) 1dx
1
2
2log 2 x
1
2log 2 {2 1} 2log 2 1
/2
/2 /2
3. x cosxdx sinx sinxdx
0 0 0
/2
sin 0 cos x
0
2 2
cos cos0 1
2 2 2
x
4. cos2 logsinxdx
0
sin2x cosx sin2x
logsin x . dx
2 0 0 sinx 2
cosx 2sin cosx 1 cos2x
x
2
0 . dx cos xdx dx
0 sinx 2 0 0 2
1 1 sin2x
1 cos2xdx x
2 2 2 0
0
1 sin2x sin0
0
2 2 2 2
/6
2
x
5. (2 3 )cos3xdx
0
2 sin3x sin3x
(2 3x ) 6x dx
3 6 6 3
2 1 /6 cos3x
0
2 3 sin3 2 dx
36 3 6 0 3
2 1 cos3x /6 /6 cos3x
2
2 x dx
12 3 3 0 0 3
2 2 1 /6
sin3x
2 (0 0)
3 36 9 0
2 2 2 2 2 2 2 4
[1 0]
3 36 9 3 36 9 36 9
4 x x
2
6. I dx
2 2x 1
4 1
)
x
( 2 x dx
2 2x 1
4
(2x 1) 1/2 4
x
( 2 x ) {(2x 1) 2x 1}dx
1
.2 2
2 2
4
{(20)(9) 1/2 (6)(5) 1/2 (2x 1) 3/2 dx
2
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