-1-
-2-
y/z=sin(15)/sin(120)....(1)
3y/z=sin(135-x)/sin(x)...(2)
نعوض 1في2 3*
sin(15)/sin(120)=
sin(135-x)/sin(x) وبحل هذه المعادلة نجد 1/
tan(x)-1/tan(135)=
3*sin(15)/sin(120)*sin(135) tan(x)=3.732050808 x=75°🍀❤🌷🌼🌸🌺
-3-
-4-