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[3(cos40+isin40)]*[4(cos80+isin80)]= ...

`[3(cos40+isin40)]*[4(cos80+isin80)]=` (A) ` -1+sqrt3i ` (B) ` 4[-1+sqrt3i]` (C) ` 2[-1+sqrt3i] ` (D) ` 6[-1+sqrt3i] `

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