What is the exact value of if and lies in Quadrant I?

Answer and explanation

Correct answer: A.

  1. Step 1: In Quadrant I, .
  2. Step 2: Use the double-angle identity: .
  3. Step 3: Substitute values: .
Answer
.
Why not the others: '' forgets the factor of in the double-angle identity; '' computes ; '' multiplies .

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