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(a x+b y)^2+(b x-a y)^2...

`(a x+b y)^2+(b x-a y)^2`

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The correct Answer is:
`(a^2+b^2)(x^2+y^2)`
Given expression `=a^2x^2+b^2y^2+b^2 x^2+a^2y^2`
`=(a^2x^2+b^2x^2)+(a^2y^2+b^2y^2)` .
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