Ruth took ten nickels from her coin jar and put them in her pocket. Only one of the nickels is dated 2006. When she reaches into
2 answers:
You might be interested in
Answer:
.
Step-by-step explanation:
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
.
.