Solve for .
Answer and explanation
Correct answer: A.
- Step 1: Find the principal value, then use the symmetry of the graph over to . Step 2. The solutions are and . **Answer: . Why not the others:** : The second solution adds to the first, which is the pattern for , not for this function. : That uses the symmetry , which belongs to cosine, not to this function. : The first angle is wrong.
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