for u=<2,1,-3> and v=<1,0,2>,
a) find the angle between u and v
b) use the formula proj_a b=((a•b)/|b|^2)b to find vectorprojection of v onto u
c) sketch vectors u, v, and the projection found with only usingarrows
d) find the area of the parallelogram determined by u and v
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