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1. The coefficient of x in the expansion of \((x + 3)\) isThe coefficient of \(x\) in the expansion of \((x + 3)^3\) is
2. If \(\frac{x}{y}+\frac{y}{x}=-1\), \(x,y\neq 0\), the value of \(x^3-y^3\) is
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