Question

Решить:cos(2x-3)=-1/2

Answer 1

Cos(2x -3) =-1/2
2x-3= +- arccos(-1/2) + 2π k
2x= 2π /3 + 2π k+3
X= 2π /6 + 2π k/2 +3/2
X=π /3 + 3/2 + π k
X= 2π +9/6 +π k ;