6. Z=2(cos12° +isin12°) Find z', and write in the form a+bi

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Q: 19. Given 0 <0 < 2T, solve 2 cos² 0 +3 sin 0 = 3. ○ 등, 똥 6 6 ○ , 풍,풍 ○ , 풍, 똥 5w 6 ○ 풍, 풍 11.

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Q: 4. Write u = -2 cos Tt – 3 sin at in the form u = Rcos(wot – 8).

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