Answer
Positive.
Work Step by Step
Since the graph of $f(x)=\frac{4}{x^{2}+1}$ is always positive and therefore greater than $y=0$ (the x-axis) through the interval $[0,\pi]$, the integral is positive.
Calculus 10th Edition
by Larson, Ron; Edwards, Bruce H.
Published by
Brooks Cole
ISBN 10:
1-28505-709-0
ISBN 13:
978-1-28505-709-5
Chapter 4 - Integration - 4.4 Exercises - Page 288: 1
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