# Calculus

Calculate the area under the graph of f(x)=1/(x^2+1) in the first quadrant

a) pi/4
b) pi/2
c) pi
d) infinite

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1. c'mon - this is one of the standard forms -- arctan(x)

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2. I don't understand. what do you mean?

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3. a trig substitution is used when calculating the integral

as oobleck says, it's a standard trick

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posted by R_scott

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