3-4 把下列复数化为代数形式：
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(1) 3∠90°
=3cos90°i+3sin90°j
=3j
(2) 5∠-30°
=5cos(-30°)i+5sin(-30°)j
=5×√3/2i+5×(-1/2)j
=5√3/2i-5/2j
(3) 20∠60°
=20cos60°i+20sin60°j
=20×1/2i+20×√3/2j
=10i+10√3j
(4) 220∠120°
=220cos120°i+220sin120°j
=220×(-1/2)i+220×√3/2j
=-110i+110√3j
=3cos90°i+3sin90°j
=3j
(2) 5∠-30°
=5cos(-30°)i+5sin(-30°)j
=5×√3/2i+5×(-1/2)j
=5√3/2i-5/2j
(3) 20∠60°
=20cos60°i+20sin60°j
=20×1/2i+20×√3/2j
=10i+10√3j
(4) 220∠120°
=220cos120°i+220sin120°j
=220×(-1/2)i+220×√3/2j
=-110i+110√3j
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