cos^2(B) = 1-sin^2(B) = 1 - 4/29 = 25/29
cosB = 5/sqrt(29)
tgB = sinB/cosB = 2/sqrt(29) : 5/sqrt(29) = 0,4 = AC/BC
AC = 0,4*BC = 4
cos^2(B) = 1-sin^2(B) = 1 - 4/29 = 25/29
cosB = 5/sqrt(29)
tgB = sinB/cosB = 2/sqrt(29) : 5/sqrt(29) = 0,4 = AC/BC
AC = 0,4*BC = 4