# Thinkwell | Exercise_2.71.pdf - Thinkwell | Exercise back...

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10/27/19, 8 : 33 PM Thinkwell | Exercise Page 1 of 1 back 4 of 4 next Correct! You said D: u = sin 2 x The correct answer is D: u = sin 2 x Explanation: Since d (sin 2 x ) = 2 cos 2 x dx , then the only factor you don’t have in the integral would be a