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so is the curve all above the x-axis from x=1 to x=2?

In fact it switches from positive to zero when we get to pi/2

|dw:1387147008713:dw|

you want to find the evaluate two integrals for this problem.

One will be from 1 to pi/2
the other will be from pi/2 to 2

I will back later.

Alright. I got it thanks :D