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\newcommand{\Bold}[1]{\mathbf{#1}}-\frac{1}{4} \, {\left(2 \, r - \frac{i \, \sqrt{A}}{a_{3} + \mbox{ksi}}\right)}^{2} {\left(a_{3} + \mbox{ksi}\right)} - \frac{\frac{1}{4} \, A}{4 \, {\left(a_{3} + \mbox{ksi}\right)}}