$$$\frac{\pi \ln\left(\tan{\left(x \right)}\right)}{20}$$$ 的积分
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求$$$\int \frac{\pi \ln\left(\tan{\left(x \right)}\right)}{20}\, dx$$$。
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求$$$\int \frac{\pi \ln\left(\tan{\left(x \right)}\right)}{20}\, dx$$$。