Eliminate Variables

Calculus Level pending

\( Evaluate:-\quad 3\int _{ 0 }^{ \pi }{ \frac { { a }^{ 2 }{ sin }^{ 2 }x\quad +\quad { b }^{ 2 }{ cos }^{ 2 }x }{ { a }^{ 4 }{ sin }^{ 2 }x\quad +\quad { b }^{ 4 }{ cos }^{ 2 }x } } dx\\ \\ { a }^{ 2 }\quad +\quad { b }^{ 2 }\quad =\quad \frac { 3\pi }{ 4 } \\ \\ { a }^{ 2 }\quad \neq \quad { b }^{ 2 }\\ \\ ab\neq 0 \)

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