Решите уравнение sin9xsin3x=1/2 cos6x
1/2(cos6x-cos12x)=1/2cos6x 1/2cos6x-1/2cos12x=1/2cos6x -1/2cos12x=0 cos12x=0 12x=П/2+Пn x=П/24+Пn/12
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1/2(cos6x-cos12x)=1/2cos6x
1/2cos6x-1/2cos12x=1/2cos6x
-1/2cos12x=0
cos12x=0
12x=П/2+Пn
x=П/24+Пn/12