T2W3L2: vectors and classpad

useful classpad functions §

• vectors: keyboard -> math 2 -> $[\frac{}{}]$
• unitV(vec): unit vector
• norm(vec): magnitude of the vector
• angle(vec1, vec2): angle of a vec
• dotP(vec1, vec2): dot product
• toRect($\frac{vec}{angle}$): covert polar form to component form
• toPol(vec1, vec2): to polar form (magnitude and direction)