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For nonzero vectors a and b with angle θ between them, a · b equals
A|a||b| sin θ
B|a||b| cos θ
C|a||b| tan θ
D|a| + |b| cos θ
Answer & Solution
Correct answer: B. |a||b| cos θ
The scalar product is defined as the product of the two magnitudes and the cosine of the included angle.
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