摘要：
$$\Large\displaystyle \int_0^{\pi/2}\ln^2(\sin x)\ln(\cos x)\tan x \,{\rm d}x$$ $\Large\mathbf{Solution:}$ Let $J$ donates the integral and it is easy 阅读全文
摘要：
$$\Large\displaystyle \int_{0}^{\frac{\pi }{2}}x^{2}\ln\left ( \sin x \right )\ln\left ( \cos x \right )\mathrm{d}x$$ $\Large\mathbf{Solution:}$ Tools 阅读全文
摘要：
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