x , y
\[\large \left ( 1-i \right )^{9}\left ( 1+i \right )^{11}\, =\, x+yi\]
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$\LARGE {\color{DarkBlue} (1-i)^{9}(1+i)^{11}=[(1-i)(1+i)]^{9}(1+i)^{2}}$
${\color{DarkBlue} =2^{9}(2i)=2^{10}i=x+yi}$
${\color{DarkBlue} \Rightarrow x=0,,y=2^{10}}$; 07-05-2016 12:03 PM
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