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   ocr: Write Z =-213-21in D trigonometric form. 210 r=va2+b2 -2v3 V-213)2+(-2)2 21 X - v16-4 4 sine-b--2--1 (-2/3,-2) F 4 2 In Quadrant III, the angle whose sineis-1/2is 180°+30 =210,: So 8=210 lo - Ind degrees Inradians Z= 4(cos210"+isin 210) Z= Complex Numbers in Trigonometric Form