Answer and explanation

Correct answer: D. 1.0

  1. Step 1: By the fundamental Pythagorean trigonometric identity, for any angle :
  2. Step 2: .
  3. Step 3: For : .
Answer
1.0.
Why not the others: '0.5' is the value of ; '1.5' is an arithmetic error; '2.0' doubles the identity.

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