SÃO 90 PONTOS! 45+ 23 PELA MELHOR! São duas questões:

01-Se z=3.(cos 3π/4+i.sen 3π/4) então z^4 vale:

a) -81
b) 81
c) -81i
d) 81i



02-A forma algébrica do número complexo z=8 (cos 7π/4+i.sen 7π/4) é:

a) 4√2 + 4√2i
b) 4√2 - 4√2i
c) 4+4i
d) 4-4i
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