Prime number

Imaginary number

Real number

Real and imaginary number

$4-3i$

$-3+4i$

$3-4i$

$-3-4i$

$\sqrt{x^{2}+y^{2}}$

$\sqrt{x^{2}-y^{2}}$

$x^{2}+y^{2}$

$x^{2}-y^{2}$