Videos:
law of sines part 1: https://www.youtube.com/watch?v=jBd8RrmGTNI
law of sines part 2: https://www.youtube.com/watch?v=EeUOrvPSvrU
law of sines part 3: https://www.youtube.com/watch?v=PSzRzU8yMJk
law of cosines: https://www.youtube.com/watch?v=roE79-zf4bY
law of cosines alternate video: https://www.youtube.com/watch?v=xraq9Ia1SZQ
vectors part 1: https://www.youtube.com/watch?v=Hw_459IGoMU
vectors part 2: https://www.youtube.com/watch?v=bDjNBB6c7sA
dot product: https://www.youtube.com/watch?v=ulzCvaIC0t0
trigonometric or polar form of complex numbers: https://www.youtube.com/watch?v=-6E0G9Wqj_U
multiplying and dividing complex numbers in trig form: https://www.youtube.com/watch?v=6X90ohlo_TY
raising complex numbers to the nth power: https://www.youtube.com/watch?v=t0frIOSAm4w
find the nth root of complex numbers part 1: https://www.youtube.com/watch?v=fvHj2VHj_v4
find the nth root of complex numbers part 2: https://www.youtube.com/watch?v=KELD7jryY6c
find the nth root of a complex number part 3: https://www.youtube.com/watch?v=PcscJFRBokw