Представить в виде произведения : cos47+ cos 73
cos47+cos73=2 cos(47+73)/2 * cos(73-47)/2=2cos60 * cos13=2*1/2*cos13=cos13
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cos47+cos73=2 cos(47+73)/2 * cos(73-47)/2=2cos60 * cos13=2*1/2*cos13=cos13