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Question

777x.77x.7xdx=

A
777x(log7)3+C
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B
777x(log7)2+C
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C
777x.(log7)3+C
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D
777x
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Solution

The correct option is A 777x(log7)3+C
777x77x7xdx

substitute u=77xdx=77xx(log7)2du

1(log7)27udu

1(log7)2(7ulog(7))

7u(log7)3

777x(log7)3+C

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