HTML Υǡ̵ɽ褦Ȥ̵ʥץ饰Ǥ
((TeX R = 4\pi R^3)) ((TeX x=\frac{-b\sqrt{b^2 - 4ac}}{2b})) ((TeX G_{-1}(x,y)=x^{n-1}+x^n-1)) ((TeX a = \frac{ \frac{ x+1 }{ y } }{ z+2 }))
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Designed for @nifty.