$$$\frac{\sin{\left(5 x \right)}}{\sin{\left(x \right)}}$$$ 的积分
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求$$$\int \frac{\sin{\left(5 x \right)}}{\sin{\left(x \right)}}\, dx$$$。
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求$$$\int \frac{\sin{\left(5 x \right)}}{\sin{\left(x \right)}}\, dx$$$。