Daily PWN 032 – PWN Test Prep

Which of the following expressions is equivalent to $\dfrac{x^4-y^4}{x^2+y^2}$ for all nonzero values of $x$ and $y$ ?
A) $x^2-y^2$

B) $\left(\dfrac{x^2-y^2}{x+y}\right)^2$

C) $(x-y)^2$

D) $(x+y)^2$

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