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When I have a question that asks something like the area of the function 1/( x^2) on the interval 5,11 I just use my Ti-89 calculator and the 'ninc' function.

However one of my questions asks for the area on the interval 0,0.7 of delta x/(1-x^2)^(1/2). How do I figure this out exactly, this doesn't make sense to me. Shouldn't the area of the section under the function and above the x axis be the height times width with delta x representing width and the function being height? My other questions were in the format function times delta x, I don't know how to do with with delta x divided by the function.