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If 4x^4 +9y^4= 64 then the maximum value...

If `4x^4 +9y^4= 64` then the maximum value of `x^2+y^2` is (where `x` and `y` are real)

A

`4/sqrt 3`

B

`4/3 sqrt (13)`

C

`32/3`

D

`32/13`

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