$\begin{array}{1 1} \sqrt {\large\frac{a^2}{v^2+v_1^2}} \\ \sqrt {\large\frac{a^2}{v^2-v_1^2}} \\a^2\sqrt {\large\frac{v^2}{v^2-v_1^2}} \\ a^2\sqrt {\large\frac{v^2}{v^2+v_1^2}}\end{array}$

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