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Mathematics 25 Online
OpenStudy (agent_a):

Can someone explain to me where the 2 (just before the integral) in Step 4, originated from, and why the bounds are now [0, pi/3] and not [-pi/3, pi/3] anymore? http://www.chegg.com/homework-help/calculus-early-transcendentals-7th-edition-chapter-6.1-problem-21e-solution-9780538497909

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