Evaluate the integral by using a substitution prior to integration by parts.
A. xln (6x + 6x2) + C
B. xln (6x + 6x2) + ln (x +1) - 2x + C
C. ln (6x + 6x2) + ln (x +1) + C
D. ln (6x + 6x2) - 2x + C
Answer: B
Mathematics
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