Answer:
Answer is n^4
Step-by-step explanation:
You add the exponent when they are multiplying and have the same base
1
.
Convert the angle to degrees:
Note, that is the sum of two common angles: and .
By the sum-angle identity of cosine:
Apply the sum formula for cosine to find the exact value of .
. In other words, and correspond to the same angle. Therefore, the cosine of would be equal to the cosine of .