Integrate [2x sin (x^2) dx]

1. Dec 29, 2005

teng125

may i know how to integ [2x sin (x^2) dx]??the answer is -cos(x^2)

thanx.........

2. Dec 29, 2005

what

use the subsititution u= x^2

3. Dec 29, 2005

marlon

$$\int 2xsin(x^2)dx = \int sin(x^2) dx^2 = -cos(x^2)$$

The clue is that

$$2xdx = dx^2$$

marlon

edit : which is basically the same as what What has stated :)

4. Dec 29, 2005

teng125

oh.....okkk...thanx.......

5. Dec 31, 2005

scholzie

Haha, you don't sound to sure on that. Does it make sense?