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If \(a-b=4\) and \(ab=45\), what is the value of \(a^3 -b^3\)?

\[ \large \frac{1 + 3 + 5 + 7 +\ldots+ 199}{2 + 4 + 6 + 8 +\ldots+ 200} = \ ? \]

**Hint**: \( 1^2 + 2^2 + 3^2 + \cdots + n^2= \frac16 n(n+1)(2n+1) \).

\[ \large { \begin{cases} {x^2-y^2=4-2xy} \\ { x+ y = 2 } \end{cases} } \]

If \(x\) and \(y\) satisfy the system of equations above, find the value of \(x-y\).

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