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

.
Research scientists use a standard practice called the _____ method to help them understand phenomena.
The least common denominator is 15. The equivalent fractions would be 10/15 and 12/15.
Answer:
13/18
Step-by-step explanation:
s t u p i d