-2(cosπ/3+isinπ/3)的三角式是

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-2(cosπ/3+isinπ/3)的三角式是-2(cosπ/3+isinπ/3)的三角式是-2(cosπ/3+isinπ/3)的三角式是=2(-cosπ/3-isinπ/3)=2(cos4π/3+i

-2(cosπ/3+isinπ/3)的三角式是
-2(cosπ/3+isinπ/3)的三角式是

-2(cosπ/3+isinπ/3)的三角式是
=2(-cosπ/3-isinπ/3)
=2(cos4π/3+isin4π/3)