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Calculus Level 5

02πa2sin2x+9cos2xdx \large \displaystyle\int _{ 0 }^{ 2\pi }{ \sqrt { { a }^{ 2 }\sin ^{ 2 }{ x } +9\cos ^{ 2 }{ x } } } \, dx

Over all constant real values of aa, what is the minimial value of the above expression?

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