cos7x cos8x + sin7x sin8x = корень из 3/2

Question

cos7x cos8x + sin7x sin8x = корень из 3/2

Answer 1

cos7xcos8x+7sin8x=√3/2

cos(7x-8x)=√3/2

cosx=√3/2

x=+-П/6+2Пn