Răspuns:
Explicație pas cu pas:
sin(2x+π/3)= -1/2
se stie ca sinusul e negativ in cadranul 3 si 4
sinπ/6=1/2=>
sin(π+π/6)=-1/2
sin7π/6= -1/2
sin(7π/6+π/2)= _1/2
sin7π/6+3π/6)= -1/2
sin 10π/6= -1/2
=
a,sin(2x+π/3)=sin7π/6
2x+π/3=7π/6
2x=7π/6-π3
2x=7π/6-2π/6
2x=5π/6
x1=5π/12
sin(2x2+π/3)=sin10π/6= sin5π/3=>
2x2+π/3=5π/3
2x2=5π/3-π/3
2x2=4π/3
x2=2π/3
