Question

решить уравнение 2cosx-1=0

Answer 1

2cosx-1=0
cosx=1/2
x=+- π/3+2πn, n∈Z

Answer 2

2cosx-1=0
2cosx= 1
cosx= 1/2
х= +- arccos(1/2) + 2πn
x= +- π/3 + 2πn, n∈z.