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**Caycee7** Ha. thanks for pointing out where it is, I know wasnt there earlier, or perhaps my vision is worse than previously suspected...

Well actually on the subject of understanding, if you dont mind:

For part 1a, i followed you for the set up and up untill the part when I think you used the pathagorean identiy to make sinx^2 into cosx+1.....

I think that it is suppose to be 1- cosx^2. and I am not sure how you pulled the pi/2 out of the integrals and got rid of the squared and made it 2x. :confused: