What is the exact value of ?

Answer and explanation

Correct answer: B.

  1. Step 1: Determine the quadrant of : , so it lies in Quadrant II.
  2. Step 2: Find the reference angle: .
  3. Step 3: In Quadrant II, cosine is negative: .
Answer
.
Why not the others: '' forgets that cosine is negative in Quadrant II; '' uses sine instead of cosine; '' is .

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