What is the probability of obtaining 3 heads and 1 tail (order irrelevant) on four flips of a fair coin?
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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