What is the angle between two non-zero vectors and if ?

Answer and explanation

Correct answer: D.

  1. Step 1: The formula for dot product is .
  2. Step 2: If and , then .
  3. Step 3: On the interval , occurs at .
Answer
.
Why not the others: '' is when vectors are parallel and pointing in the same direction (where ); '' gives ; '' is when vectors are antiparallel (where ).

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