1.

If U=sqrt(a^(2)cos^(2) theta+ b^(2) sin^(2) theta)+ sqrt(b^(2)cos^(2) theta+ a^(2) sin^(2) theta) then the difference between the maximum and minimum values of U^(2) is given by

Answer»

`2(a^(2) + B^(2))`
`2sqrt(a^(2) + b^(2))`
`(a+b)^(2)`
`(a-b)^(2)`

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