Cos ax -cos bx / cos cx - cos dx
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Cosc-cosd=-2sin(c+d)*2sin(c-d)/2
Cos ax -cos bx / cos cx - cos dx=(-2sin(a+b)/2 *sin(a-b)/2)/(-2sin(c+d)*2sin(c-d)/2). =sin(a+b)/2 *sin(a-b)/2)/(sin(c+d)/2*2sin(c-d)/2).
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