cos7x cos8x + sin7x sin8x = корень из 3/2
cos7xcos8x+7sin8x=√3/2
cos(7x-8x)=√3/2
cosx=√3/2
x=+-П/6+2Пn
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cos7xcos8x+7sin8x=√3/2
cos(7x-8x)=√3/2
cosx=√3/2
x=+-П/6+2Пn