回復 21# man90244 的帖子
已知\(\pi<\theta<2\pi\),則複數\(1+icot\theta\)的極式為
(A)\(\displaystyle \frac{1}{sin\theta}[sin(-\theta)+icos(-\theta)]\)
(B)\(\displaystyle \frac{1}{sin\theta}[cos(\frac{\pi}{2}-\theta)+isin(\frac{\pi}{2}-\theta)]\)
(C)\(\displaystyle \frac{-1}{sin\theta}[cos(\frac{\pi}{2}+\theta)+isin(\frac{\pi}{2}+\theta)]\)
(D)\(\displaystyle \frac{-1}{sin\theta}[cos(\frac{3\pi}{2}-\theta)+isin(\frac{3\pi}{2}-\theta)]\)
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99全國高中聯招I4.png
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2012-6-17 21:32