Given that \(xy > 0\), which of the following must also be greater than zero?

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A

B

C

D

E

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Source: Magoosh

Given that \(xy > 0\), which of the following must also be greater than zero?

A. \(x+y\)

B. \(x^2+y\)

C. \((x+y)^2\)

D. \(x^2-y^2+100\)

E. \((x-y)^2\)

The OA is C