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int\ 7^(7^(7^x)) * 7^(7^x) * 7^x \ dx...

`int\ 7^(7^(7^x)) * 7^(7^x) * 7^x \ dx`

A

`(7^(7^(7^(x))))/((log7)^(3))+C`

B

`(7^(7^(7^(x))))/((log7)^(2))+C`

C

`7^(7^(7^(x)))*(log7)^(3)+C`

D

`7^(7^(7^(x)))`

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