Solve {l}{b^2=a^2/2}{b=sqrt{a^2/2}}

$$\left. \begin{array} { l } { b ^ { 2 } = \frac { a ^ { 2 } } { 2 } } \\ { b = \sqrt { \frac { a ^ { 2 } } { 2 } } } \end{array} \right.$$

Solve for b, a (complex solution)

$$b=\frac{\sqrt{2a^{2}}}{2}$$

$$a\in \mathrm{C}$$

Solve for b, a

$$b=\frac{\sqrt{2}|a|}{2}$$

$$a\in \mathrm{R}$$