Question

Решите уравнение
2cosx-1=0

Answer 1

2cos(x) = 1;

cos(x) = 1/2;

x = ±π/3 + 2πk, k∈Z.

Ответ: ±π/3 + 2πk, k∈Z.

Answer 2

2cosx=1

cosx=1/2

x=+-arccos 1/2 + 2pn

x=+-P/3 + 2pn ,n∈Z