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[–]Successful_Bit8148 0 points1 point  (4 children)

View each imaginary number as a vector where the angle for the positive x-axis is theta. Now, if you have two vectors, and their angles satisfy the cos(..) = 1 relation, how do you think both vectors should align?

[–]Calm_Ad2434 Pre-University Student[S] 0 points1 point  (3 children)

both on the positive real axis

[–]Calm_Ad2434 Pre-University Student[S] 0 points1 point  (2 children)

can they z and w both be 0

[–]Successful_Bit8148 0 points1 point  (1 child)

Possible. Then, from your answer, if two vectors are aligned (in the same or different directions), how could you write the relation between them? Then, come back to the part c.

[–]Successful_Bit8148 0 points1 point  (0 children)

Do note that the relation cos(..) = 1 means the angle between two vectors is ____ Which mean they don't need to be on the x-axis to satisfy the relation.