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2 votes
Question part points submissions used find a ·

b. |a| = 40, |b| = 90, the angle between a and b is 3π/4.

User Ddarellis
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1 Answer

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Consider, pls, the suggested option:
1. formula is: a*b=|a||b|cos(ab);
2. a*b=40*60*cos135°=2400/√2 (≈1697,0563).
User YjyJeff
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