Datrys ar gyfer a, c, d, b
a=-\sqrt{c^{2}+1}\text{, }c\in \mathrm{R}\text{, }d=-\sqrt{c^{2}+1}\text{, }b=c
a=-\sqrt{c^{2}+1}\text{, }c\in \mathrm{R}\text{, }d=\sqrt{c^{2}+1}\text{, }b=-c
a=\sqrt{c^{2}+1}\text{, }c\in \mathrm{R}\text{, }d=-\sqrt{c^{2}+1}\text{, }b=-c
a=\sqrt{c^{2}+1}\text{, }c\in \mathrm{R}\text{, }d=\sqrt{c^{2}+1}\text{, }b=c
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