No clue how to start this problem. Any help appreciated, I'll be looking through my notes to see if we've done something similar to this one in the mean time.
You made an error when you took the derivative of . Remember chain rule? A factor of 2 should then appear in your derivative which you can then factor out et voila. A standard integral.
You made an error when you took the derivative of . Remember chain rule? A factor of 2 should then appear in your derivative which you can then factor out et voila. A standard integral.