a vector: A= Axi+ Auj+ A2k components: AC,Ay,A2 unit vectors: i,j,k addition: A+B=(Ax+ Bx)i+(Ay+Byj(A2+ Byk and subtraction A-B=(Ax-Bxrji+(Ay- Byj+(Az-Byk scalar product(dot product) A B=B A=ArBr+AyBy+ ABx A·B= AB cos6 where 0 is the angle bwtn a and B