Question

Нужна ваша помощь .......

Answer 1

20
cos2x=√3/2
2x=+-π/6+2πk
x=+-π/12+πk,k∈z
21
3sin²x+cos²x-2=0
3(1-cos2x)/2+(1+cos2x)/2-2=0
3-3cos2x+1+cos2x-4=0
-2cos2x=0
2x=π/2+πk
x=π/4+πk/2,k∈z