В треугольнике АВС угол С=90 градусов, АВ=40, ВС=24. Найдите косинус А.
AB=40
BC=24
cosA-?
AC-?
AC^2=AB^2-BC^2
AC^2=1600-576
AC^2=1024
AC=32
cosA=AC/AB
cosA=32/40
cosA=4/5
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AB=40
BC=24
cosA-?
AC-?
AC^2=AB^2-BC^2
AC^2=1600-576
AC^2=1024
AC=32
cosA=AC/AB
cosA=32/40
cosA=4/5