Answer
$ 2 \sin {\theta} $
Work Step by Step
$ \int { \sqrt{4-x^2} dx} $ has the form $ \sqrt{a^2-u^2} $ so
$ u=a \sin {\theta} $, $ a=2 $
$ u=2 \sin {\theta} $
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 8 - Integration Techniques, L'Hopital's Rule, and Improper Integrals - 8.4 Exercises - Page 539: 2
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