____ is a common denominator because 3 goes into it and 4 goes into it.
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This question is asking "Where does cosine equal 
?"
Based on our unit circle values and the domain of the cos^{-1} function, we see that at 30 degrees, or
, cosine is equal to .
Based on our unit circle values and the domain of the cos^{-1} function, we see that at 30 degrees, or