I-solve ang A, a, b, c
A=2\pi n_{1}+\arctan(\frac{12}{5})\text{, }n_{1}\in \mathrm{Z}\text{, }a=\frac{12}{5}=2.4\text{, }b=\frac{12}{5}=2.4\text{, }c=\frac{12}{5}=2.4
A=2\pi n_{2}+\pi -\arctan(\frac{12}{5})\text{, }n_{2}\in \mathrm{Z}\text{, }a=-\frac{12}{5}=-2.4\text{, }b=-\frac{12}{5}=-2.4\text{, }c=-\frac{12}{5}=-2.4
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