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a = 3/sqrt(2)*i + 3/sqrt(2)*j

b = 5j

a.b = |a|*|b|*cos(q)

= 3*5*cos(45) = 15/sqrt(2)

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Q: I have magnitude and angle how can find a b and a Dot b a 3 angle 45 b 5 angle 90 Find A B A dot B?
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