Question

Как решить тригонометрическое уравнение: 2 cos x – 1 = 0 ?

Answer 1

2cosx=1|÷2
Cosx=1/2
Arccos 1/2 =60°
X=+- Arcсos a+2п×n
=> x=+- 60°+360°n

Answer 2

Х=+- Archos a + 2п×n

Answer 3

Х=+-60°+360°n

Answer 4

2 cos x – 1 = 0 

2 cos x = 1

cos x = 1/2

 х = + - π/3  + 2πK, K ∈ Z