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https://tex.z-dn.net/?f=cos%5E23x-sin%5E23x-cos4x%3D0%5C%5Ccos(2*3x)-cos4x%3D0%5C%5Ccos6x-cos4x%3D0%5C%5C-2sin%5Cfrac%7B6x%2B4x%7D%7B2%7D*sin%5Cfrac%7B6x-4x%7D%7B2%7D%3D0%5C%5C-2sin5x*sinx%3D0%7C%3A(-2)%5C%5Csin5x*sinx%3D0%5C%5C%5C%5Csin5x%3D0%5C%5C%205x%3D%5Cpi%20n%2C%20n%5Cin%20Z%5C%5Cx%3D%5Cpi%20n%2F5%2C%20n%20%5Cin%20Z%5C%5C%5C%5Csinx%3D0%5C%5Cx%3D%5Cpi%20n%2C%20n%5Cin%20Z
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