Here's a quick introduction to unit tangent, unit normal, and unit binormal vectors that you need to know for your Calculus 3 class! Subscribe to @bprpcalculusbasics for more calculus tutorials! Proof that if a vector has constant length, then it's orthogonal to r': Support this channel and get my calculus notes on Patreon: 👉 Get the coolest math shirts from my Amazon store 👉 ----------------------------- #calculus #bprpcalculus #apcalculus #tutorial #math