复变函数,关于cos(z)的值域实数函数里cos(x)的值域是[-1,1]到了复数里cos(z)=(e^iz+e^-iz)/2(e^iz+e^-iz)恒大于零啊,cos(z)的值域多少?
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![复变函数,关于cos(z)的值域实数函数里cos(x)的值域是[-1,1]到了复数里cos(z)=(e^iz+e^-iz)/2(e^iz+e^-iz)恒大于零啊,cos(z)的值域多少?](/uploads/image/z/8573155-43-5.jpg?t=%E5%A4%8D%E5%8F%98%E5%87%BD%E6%95%B0%2C%E5%85%B3%E4%BA%8Ecos%28z%29%E7%9A%84%E5%80%BC%E5%9F%9F%E5%AE%9E%E6%95%B0%E5%87%BD%E6%95%B0%E9%87%8Ccos%28x%29%E7%9A%84%E5%80%BC%E5%9F%9F%E6%98%AF%5B-1%2C1%5D%E5%88%B0%E4%BA%86%E5%A4%8D%E6%95%B0%E9%87%8Ccos%28z%29%3D%28e%5Eiz%2Be%5E-iz%29%2F2%28e%5Eiz%2Be%5E-iz%29%E6%81%92%E5%A4%A7%E4%BA%8E%E9%9B%B6%E5%95%8A%2Ccos%28z%29%E7%9A%84%E5%80%BC%E5%9F%9F%E5%A4%9A%E5%B0%91%3F)
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