sin A=CB/AB
CB=sqrt(AB^2-AC^2)=sqrt(30^2-(3sqrt19)^2)=sqrt(900-9*19)=
=sqrt(900-171)=sqrt(729)=27
sinA=27/30=9/10=0,9
sin A=CB/AB
CB=sqrt(AB^2-AC^2)=sqrt(30^2-(3sqrt19)^2)=sqrt(900-9*19)=
=sqrt(900-171)=sqrt(729)=27
sinA=27/30=9/10=0,9