Datrys ar gyfer a, d, c
a=-\sqrt{16-c}+4\text{, }d=\frac{2\sqrt{16-c}}{3}\text{, }c\leq 16
a=\sqrt{16-c}+4\text{, }d=-\frac{2\sqrt{16-c}}{3}\text{, }c\leq 16
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