int(4^(x+1)-7^(x-1))/(28^(x))dx is equal...

`int(4^(x+1)-7^(x-1))/(28^(x))dx` is equal to

A

`(1)/(7log_(e)4)4^(-x)-(4)/(log_(e)7)7^(-x)+C`

B

`(1)/(7log_(e)4)4^(-x)+(4)/(log_(e)7)7^(-x)+C`

C

`(4^(-x))/(log_(e)7)-(7^(-x))/(log_(e)4)+C`

D

`(4^(-x))/(log_(e)4)-(7^(-x))/(log_(e)7)+C`

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The correct Answer is:

A

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