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Desmos ⟩ 函數 ⟩ atan2(y, x)
內建函數： −π<arctan(y,x)≤π-\pi\lt\arctan(y,x)\le\pi−π<arctan(y,x)≤π
⭐️ 注意：
arctan(y,x)=tan−1(y,x)\arctan(y,x)=\tan^{-1}(y,x)arctan(y,x)=tan−1(y,x) 也就是一般說的 atan2(y,x)\text{atan2}(y,x)atan2(y,x)
arctan(yx)≠arctan(y,x)\arctan(\frac{y}{x})\ne\arctan(y,x)arctan(xy)=arctan(y,x)
https://www.desmos.com/calculator/l39ccr8e9v
reddit ⟩ Desmos atan2 implementation ⭐️