The general equation to the cone of second degree which passes through the axes, is

1
\(\dfrac{x^2}{a}+\dfrac{y^2}{b}+\dfrac{z^2}{c}=0\)
2
fyz + gzx + hxy = 0
3
ax2 + by2 + cz2 = 0
4
\(\sqrt{fx}+\sqrt{gy}+\sqrt{hz}=0\)

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