复数z=-3(cos-isin(i是虚数单位)的三角形式是……( )A.3[cos

复数z=-3(cos-isin(i是虚数单位)的三角形式是……(  )

A.3[cos(-)+isin(-)]       

B.3(cos+isin

C.3(cos+isin)            

D.3(cos-isin

答案

C

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