Khan Academy
Proof: Law of Sines, Trig Identities and Examples, Trigonometry
Sal proves the Law of Sines in this video by using the SOH-CAH-TOA model and setting up equivalent ratios.
Curated OER
What is the Law of Sines?
The Law of Sines is derived in this video by using formula for the area of a triangle that multiplies _ times two adjacent sides and the sine of their included angle.