Question 1131498
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On first reading, my thought was that we obviously can't answer the question, because we don't know what theta is.<br>
Then I thought maybe all but one of the answer choices was a value less than -1 or greater than 1, which would make them invalid values for cosine.  But all three of the answer choices with radicals can, if parentheses are placed right, have values between -1 and 1.<br>
So my conclusion is that the problem is faulty, or that your statement of the problem is incomplete.