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**integration by parts!!!! MIDTERM...really quick question....please help!!!!**

## Homework Statement

[tex]\int[/tex] arctan4t dt

## Homework Equations

## The Attempt at a Solution

ive been attempting this all day. the answer is t arctan4t-1/8 ln(1+16t^2)+C

i get this asnwer up until the 1/8.......

a few steps befor emy answer i have t arctan4t - [tex]\int[/tex] 4t/ 1+16t^2

i dont kno whow to go from here to the answer....someone please help!!!