Double integration using trig term

[glog]

Homework Statement

\int^1_0 \int^1_y sin(x^2) dx dy

The Attempt at a Solution

This equation cannot be integrated nicely, so I tried to reverse the order of integration:

\int^1_0 \int^1_x sin(x^2) dy dx

However this only helps for the first step, since when we intregrate by y, we get:

\int^1_0 sin(x^2)-xsin(x^2) dx

I'm stuck... again! Any ideas?

 

[Defennder]

This equation cannot be integrated nicely, so I tried to reverse the order of integration:
\int^1_0 \int^1_x sin(x^2) dy dx

Your limits in the new double integral is incorrect. If in doubt, look at the original double integral and draw a picture of the region enclosed by the limits. Then try to express the limits of the double integral in the reversed order of the same region.

 

[glog]

Alright so perhaps the bounds are then: \int^1_0 \int^x_0

In which case, my integral simplifies to:

\int^1_0 x sin(x^2)

Which becomes:

-1/2 cos (x^2) | 1_0

This make sense?

 

[Defennder]

Yep, you got it.