1
√3tg(x/3+π/6)=3
tg(x/3+π/6)=√3
x/3+π/6=π/3+πn
x/3=-π/6+π/3+πn
x/3=π/6+πn
x=π/2+3πn,n∈z
2
sin2x=√2/2
2x=(-1)^n*π/4+πk
x=(-1)^n*(π/8)+πn/2,n∈z
3
4sin²x+11sinx-3=0
sinx=a
4a²+11a-3=0
D-121+48=169
a1=(-11-13)/8=-3⇒sinx=-3<-1 нет решения<br>a2=(-11+13)/8=1/4⇒sinx=1/4⇒x=(-1)^n*arcsin0,25+πn,n∈z