Answer
$$ - 2$$
Work Step by Step
$$\eqalign{
& \frac{{4\operatorname{cis} {{270}^ \circ }}}{{2\operatorname{cis} {{90}^ \circ }}} \cr
& {\text{Then,}} \cr
& = \frac{4}{2}\operatorname{cis} \left( {{{270}^ \circ } - {{90}^ \circ }} \right) \cr
& {\text{Simplifying}} \cr
& = 2\operatorname{cis} \left( {180} \right) \cr
& {\text{Write in the rectangular form}} \cr
& = 2\left( {\cos {{180}^ \circ } + i\sin \left( {{{180}^ \circ }} \right)} \right) \cr
& = 2\left( { - 1 + i\left( 0 \right)} \right) \cr
& = - 2 \cr} $$
