![\frac{ \cos(5x) \: - \: \cos(3x) }{ \cos(3x) - \cos(5x) } \frac{ \cos(5x) \: - \: \cos(3x) }{ \cos(3x) - \cos(5x) }](https://tex.z-dn.net/?f=+%5Cfrac%7B+%5Ccos%285x%29+%5C%3A++-++%5C%3A++%5Ccos%283x%29++%7D%7B+%5Ccos%283x%29++-++%5Ccos%285x%29+%7D+)
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