{cosxcosy=0,75 {sinxsiny=0,25

Question

{cosxcosy=0,75 {sinxsiny=0,25

Answer 1

cos(x-y)=cosxcosy+sinxsiny

cos(x-y)=1

x-y=0.

x=y.

sin^2 x =1\4.

sin x = +- 1\2.

x=+-пи\6