Question

How do you show that i*i=j*j=k*k=1 for vectors/dot product?

Answer 1

i is a unit vector so l i l =1
i * i= l i l * l i lcos(0) =1*1*1=1
similarly j*J=k*k=1

Answer 2

Is i being a unit vector a basic definition or based on another proof?

Answer 3

its a basic definition

Answer 4

Got it, thanks!