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Question

Solve 1x7x(1+x7)dx

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Solution

1x7x(1+x7)dx=1+x72x7x(1+x7)dx

=(4+x7)x(1+x7)dx2x6(1+x7)dx

=dxx2x61+x7dx

lnx2x61+x7dx
1+x7=t
7x6dx=dt
=lnx=27dtt
=lnx=27lnt+C
=lnx27ln(1+x7)+C=lnxln(1+x7)2/7+C
=ln(x(1+x7)2/7)+C

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