Integral ( I was too lazy to make a good name... )

Calculus Level 3

12xx2+4x+8dx=arctanabarctanc+1dlnef\large \int _{ 1 }^{ 2 }{ \frac { x }{ { x }^{ 2 }+4x+8 } } dx = \arctan { \frac { a }{ b } } -\arctan { c } +\frac { 1 }{ d } \ln { \frac { e }{ f } }

The equation above holds true for some positive integers aa, bb, cc, dd, ee and ff, with gcd(a,b)=gcd(e,f)=1\gcd(a,b) = \gcd(e,f) = 1. What is a+b+c+d+e+f a+b+c+d+e+f ?

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