多项式的n次幂

$\displaystyle{{(3x^{6}+4x^{5}+5x^{4}+(5+3i)x^{3}+x^{2}+3x+7i)}^{5}}$

$243x^{30}+1620x^{29}+6345x^{28}+(18585+1215i)x^{27}+(43395+6480i)x^{26}+(85699+21060i)x^{25}+(144670+54855i)x^{24}+(213830+116430i)x^{23}+(281535+217380i)x^{22}+(320290+361080i)x^{21}+(314585+537170i)x^{20}+(240575+733945i)x^{19}+(84585+893980i)x^{18}+(-118665+998250i)x^{17}+(-380980+1017665i)x^{16}+(-623090+898268i)x^{15}+(-813665+729290i)x^{14}+(-955410+455870i)x^{13}+(-906105+165560i)x^{12}+(-836255-31875i)x^{11}+(-676034-274470i)x^{10}+(-410765-330030i)x^{9}+(-299685-347715i)x^{8}+(-81075-357955i)x^{7}+(17240-177170i)x^{6}+(-1717-173110i)x^{5}+(108535-103495i)x^{4}+(46795+15435i)x^{3}+(12005-30870i)x^{2}+36015x+16807i$