Datrys ar gyfer D (complex solution)
D=\frac{x}{x^{2}+y^{2}+z^{2}}
x\neq -i\sqrt{y^{2}+z^{2}}\text{ and }x\neq i\sqrt{y^{2}+z^{2}}
Datrys ar gyfer D
D=\frac{x}{x^{2}+y^{2}+z^{2}}
z\neq 0\text{ or }y\neq 0\text{ or }x\neq 0
Rhannu
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