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![\sqrt{ }1 - cos a \div \sqrt{1 + cosa} = coseca - cota \\ \\ \sqrt{ }1 - cos a \div \sqrt{1 + cosa} = coseca - cota \\ \\](https://tex.z-dn.net/?f=+%5Csqrt%7B++%7D1+-+cos+a+%5Cdiv++%5Csqrt%7B1+%2B+cosa%7D++%3D+coseca+-+cota+%5C%5C++%5C%5C+)
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