Помогите сократить дробь:
cosa-cos5a/2sin6a
cosa-cos5a=2sin3a*sin2a 2sin6a=4sin3a*cos3a 2sin3a*sin2a/4sin3a*cos3a=sin2a/2cos3a
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cosa-cos5a=2sin3a*sin2a
2sin6a=4sin3a*cos3a
2sin3a*sin2a/4sin3a*cos3a=sin2a/2cos3a