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Answer:
Shown below
Step-by-step explanation:
First allocate the power of three to every number
=
not sure what you mean by positive exponents, the exponents already are positive. Maybe you mean positive exponents and integers?
Given:
There are given that the cos function:
Explanation:
To find the value, first, we need to use the half-angle formula:
So,
From the half-angle formula:
Then,
Since 105 degrees is the 2nd quadrant so cosine is negative
Then,
By the formula:
Then,
Put the value of cos210 degrees into the above function:
So,
Final answer:
Hence, the value of the cos(105) is shown below: