If $x-y=15$ and $xy=4$, what is the value of $x^2+y^2$?
Question:
If $x-y=15$ and $xy=4$, what is the value of $x^2+y^2$?
Answer:
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If $x-y=15$ and $xy=4$, what is the value of $x^2+y^2$?
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