Question

cos(x-пи/6)+cos(x+пи/6)=0 Решить уравнение

Answer 1

cos(x)*cos(p/6)-sin(x)*sin(p/6) + cos(x)*cos(p/6)+sin(x)*sin(p/6) = 
2cos(x)*cos(p/6) = 0
cos(p/6) = корень(3)/2
корень(3)*cos(x) = 0
x = p/2 + n*p