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I need to use the trapezoid rule to approximate the following integral: $\int^{0}_{-2}\frac{1}{4+x^2}dx$ for a given step $n=5$.

I'm not exactly sure how to do a problem like this.

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    except, that formula says 2n where it is supposed to be 1n. Regardless, could you solve the problem so I can verify that I have the correct answer? this problem is a test grade! also, I tried to do a similar problem and I got it wrong somehow..2012-07-30

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http://www.ugrad.math.ubc.ca/coursedoc/math101/notes/techniques/numerical.html, check if it helps..