Three Dimensional Geometry

$\frac{x}{b^2-c^2}=\frac{y}{c^2-a^2}=\frac{z}{a^2-b^2}$

$\frac{\boldsymbol{x}}{a^2-b c}=\frac{\boldsymbol{y}}{b^2-c a}=\frac{\boldsymbol{Z}}{c^2-a b}$

$\frac{x}{b}=\frac{y}{c}=\frac{z}{a}$

$\frac{x}{b^2+c^2}=\frac{y}{c^2+a^2}=\frac{z}{a^2+b^2}$