Помогите решить:12,14,16,18,20,22,24,26,28,30

12
sin(x-/4)=0
x-/4=n
x=/4+n,nz
14
sin(x-/3)=0
x-/3=n
x=/3+n,nz
16
tg(/3-x)=0
-tg(x-/3)=0
x-/3=n
x=/3+n,nz
18
cosx=-2/2
x=+-3/4+2n,nz
20
cos(x-)=-1
-cosx=-1
cosx=1
x=2n,nz
22
1/2*sin2x=3/4
sin2x=3/2
2x=(-1)^n*/3+n
x=(-1)^n*/6+n/2,nz
24
1-cos(x/3+/3)=1/2
cos(x/3+/3)=1/2
x/3+/3=+-/3+2n
x/3=-2/3+2n U x/3=2n
x=+-2+6n U x=6n,nz
26
tg3x=4
3x=arctg4+n
x=1/3*arctg4+n/3,nz
28
cosxcos2x=0
cosx=0x=/2+n,nz
cos2x=02x=/2+nx=/4+n/2,nz
30
2cosx=1
2cosx-1=0
cos2x=0
2x=/2+nx=/4+n/2,nz