-20.88 + -2.20 i
21(cos 186º) + i21(sin 186º) . . . use calc
= - 20.88 - 2.20 i
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-20.88 + -2.20 i
21(cos 186º) + i21(sin 186º) . . . use calc
= - 20.88 - 2.20 i