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If \(x - y = 4\) and \(xy = 45\) , find \(x^2 + y^2\) and \(x^2 - y^2\).
Ans:
\(x^2 + y^2\) \(=\)
\(x + y\) \(=\)
\(x^2 - y^2\) \(=\)
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