Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 4 - No. 46)
Which is the law of sines?
a/sinA=b/sinB=c/sinC
a^2+b^2=c^2
a^2=b^2+c^2-2bc*cosA
sinA/a=cosB/b
Paliwanag
The formula a/sinA = b/sinB = c/sinC defines the Law of Sines.