m92−2mn+9n2\frac{m}{9}^2-\frac{2m}{n}+\frac{9}{n^2}9m2−n2m+n29
tan(y)cot(y)=1\tan\left(y\right)\cot\left(y\right)=1tan(y)cot(y)=1
limx→∞(n−1n)\lim_{x\to\infty}\left(\frac{n-1}{n}\right)x→∞lim(nn−1)
limx→1(1+x−2x−1)\lim_{x\to1}\left(\frac{\sqrt{1+\sqrt{x}}-\sqrt{2}}{x-1}\right)x→1lim(x−11+x−2)
8+x2−4x3+5x28+x^2-4x^3+5x^28+x2−4x3+5x2
∫x2(5+2x4)dx\int x^2\left(5+2x^4\right)dx∫x2(5+2x4)dx
81 : 3 − 21 : 3 − 4 : 2 81\::\:3\:-\:21\::\:3\:-\:4\::\:2\:81:3−21:3−4:2
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