(1/x)\left[\arccos\left(\frac{1}{x\sqrt{x^{2} 2x\cos y+1}} \frac{1}{x}\right) Y\right]

请输入您的数学问题…… (1/x)\left[\arccos\left(\frac{1}{x\sqrt{x^{2}-2x\cos y+1}}-\frac{1}{x}\right)-y\right]

问题

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