Atrast x
\left\{\begin{matrix}x=\arccos(\sqrt{1-y})+2\pi n_{1}\text{, }n_{1}\in \mathrm{Z}\text{; }x=-\arccos(\sqrt{1-y})+2\pi n_{2}\text{, }n_{2}\in \mathrm{Z}\text{, }&y\geq 0\text{ and }y\leq 1\text{ and }\sqrt{1-y}\leq 1\\x=-\arccos(\sqrt{1-y})+2\pi n_{3}+\pi \text{, }n_{3}\in \mathrm{Z}\text{; }x=\arccos(\sqrt{1-y})+2\pi n_{4}-\pi \text{, }n_{4}\in \mathrm{Z}\text{, }&y\geq 0\text{ and }y\leq 1\text{ and }-\sqrt{1-y}\geq -1\end{matrix}\right,
Atrast y
y=-\left(\cos(x)\right)^{2}+1
Graph
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