cos7a-cos5a/2sin6a = -2sinasin6a/2sin6a= -sina
cosa-cosb=-2sin((a+b)/2)sin((a-b)/2)
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cos7a-cos5a/2sin6a = -2sinasin6a/2sin6a= -sina
cosa-cosb=-2sin((a+b)/2)sin((a-b)/2)