cos6a*cosa+sin6a*sina, if a=3π/5;
cos6a*cosa+sin6a*sina=cos(6a-a)=cos5a=cos3π=cosπ=-1.
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cos6a*cosa+sin6a*sina, if a=3π/5;
cos6a*cosa+sin6a*sina=cos(6a-a)=cos5a=cos3π=cosπ=-1.