好耶，是高等数学
|$当 {🍪}\to 0$||
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|$\sin{🍪} \sim 🍪$|$\tan🍪\sim🍪$|
|$\ln({1+🍪}) \sim 🍪$|$e^🍪-1\sim🍪$|
|$\arcsin🍪 \sim 🍪$|$\arctan🍪\sim🍪$|
|$\log_a(1+🍪)\sim \frac{🍪}{\ln a}$|$a^🍪-1\sim🍪\ln a$|
|$1-\cos🍪\sim\frac{1}{2}🍪^2$|$ln{(🍪+\sqrt{1+🍪^2})}\sim🍪$|
|$🍪-\sin🍪\sim\frac{1}{6}🍪^3$|$\tan🍪=🍪\sim\frac{1}{3}🍪^3$|
|${(1+🍪)}^\alpha-1\sim\alpha🍪$|$\arcsin🍪-🍪\sim\frac{1}{6}🍪^3$|
|$🍪-\arctan🍪\sim\frac{1}{3}🍪^3$|$\tan🍪-\sin🍪\sim\frac{1}{2}🍪^3$|
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