АВ=55
ВС=33
cosA-?
АС-?
АВ^2=AC^2+BC^2
AC^2=AB^2-BC^2
AC^2=55^2-33^2
AC^2=1936
AC=44
cosA=AC/AB
cosA=44/55
cosA=4/5
АВ=55
ВС=33
cosA-?
АС-?
АВ^2=AC^2+BC^2
AC^2=AB^2-BC^2
AC^2=55^2-33^2
AC^2=1936
AC=44
cosA=AC/AB
cosA=44/55
cosA=4/5