User:Bxshan

This user can contribute with a professional level of English.

該用戶的母語是中文。
该用户的母语是中文。

ßoxuan

Hello, I'm Boxuan!^{[citation needed]}

你好，我是博宣！^{[citation needed]}

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$\int udv=uv-\int vdu$

$f'(x)=\lim _{x\to 0}{\frac {f(x+h)-f(x)}{h}}$

$f(x)=\int _{a}^{x}f'(t)dt$

$\int _{a}^{b}f(x)dx=F(b)-F(a)$