1)Vector in Cartesian coordinate A=A i+Aj+Ak 2)Magnitude of vector A=、A2+A2+ 3)Sum and subtraction 4)Multiplication Dot product AB=AB+AB,+A B=AB cos Cross product k V×A=1) Vector in Cartesian coordinate A A i A j A k x y z     = + + 2) Magnitude of vector 3) Sum and subtraction 4) Multiplication Dot product: Cross product: A• B = Ax Bx + Ay By + Az Bz = ABcos   Ax Ay Az x y x i j k A        =     2 2 2 A = Ax + Ay + Az