Видео ютуба по тегу Cy'd

Обзор конго TYCOON STCS-BS CY/D
Обзор конго TYCOON STCS-BS CY/D
CY:D - Opinions Freestyle | Lets Lab!
CY:D - Opinions Freestyle | Lets Lab!
CY:D - Plot Twist | GC Presents: The Box
CY:D - Plot Twist | GC Presents: The Box
Prove that the line x=ay+b , z=cy+d and x=a'y+b ,z=c'y+d are perpendicular if aa'+cc'+1=0
Prove that the line x=ay+b , z=cy+d and x=a'y+b ,z=c'y+d are perpendicular if aa'+cc'+1=0