Who's up to the challenge? 20
Calculus
Level
5
\[ \large \int _{ 0 }^{ \infty } { x }^{ 3 }{ e }^{ -3x }\sin { x } \, dx \]
If the integral above is the form of \( \dfrac ab\), where \(a\) and \(b\) are coprime positive integers, find \(a+b\).
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