题目内容
计算下列定积分.
(1)
(4x-x2)dx;(2)
cos2xdx.
(1)
| ∫ | 3-1 |
| ∫ |
|
(1)原式=
4xdx-
x2dx
=2x2|_-13
=16-
=
(2)原式=
(
+
cos2x)dx
=(
x+
sin2x)|_-
=
.
| ∫ | 3-1 |
| ∫ | 3-1 |
=2x2|_-13
=16-
| 28 |
| 3 |
=
| 20 |
| 3 |
(2)原式=
| ∫ |
|
| 1 |
| 2 |
| 1 |
| 2 |
=(
| 1 |
| 2 |
| 1 |
| 4 |
| π |
| 2 |
| π |
| 2 |
=
| π |
| 2 |
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