sinx*cosy=3/4 x+y=5p/6 система уравнений Помогите срочно

Question

sinx*cosy=3/4
x+y=5p/6 система уравнений
Помогите срочно

Answer 1

{x+y=5π/6
{sinx*cosy=3/4⇒1/2*(sin(x-y)+sin(x+y))=3/4
sin(x-y)+sin(x-+y)=3/2
sin(x-y)+sin5π/6=3/2
sin(x-y)=3/2-1/2
sin(x-y)=1
{x-y=π/2
{x+y=5π/6
2x=4π/3
x=2π/3
y=5π/6-2π/3=5π/6-4π/6
y=π/6
(2π/3;π/6)