What is the exact value of ?

Answer and explanation

Correct answer: D.

  1. Step 1: Use the special right triangles: the -- triangle (sides ) and the triangle (sides ).
  2. Step 2: .
Answer
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Why not the others: : that is the exact value of a different angle or function. : that is the exact value of a different angle or function. : that is the exact value of a different angle or function.

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