∠А=180°-60°-45°=75°
по теореме синусов
AC/sin45°=BC/sin75°, sin75°≈0.94, √6≈2.45 sin60°=√3/2
2AC/√2=√3/sin75°
AC=√6/2sin75°=√6/2*0.97=√6/1.9=1.3
AB/sin60°=√3/sin75°
AB=3/2*0.97=1.54
Sin^2(3x)+cos(6x)=sin^2(3x)+cos^2(3x)-sin^2(3x)=cos^2(3x)
5x-1<5
5x<6
x<1.2
5x-1>-6
x>-1
-1<x<1.2
700:x=700
x=700:700
x=1
проверка:
700:1=700