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Vectors V1 and V2 are different vectors with lengths V1 and V2 respectively

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Vectors V1 and V2 are different vectors with lengths V1 and V2 respectively. Find the following:
c) V1*V1 (Express you answer in terms of V1)
d) V1*V2, When they are perpendicular
e) V1*V2, When they are parallel (Express your answer in terms of V1 and V2)