Answer:
C
Step-by-step explanation:
The correct answer would be
. Therefore, none of the answer choices fulfill this and A and B are not correct.
Answer:

Step-by-step explanation:
Let use the following trigonometric identities:

Then, the equation is simplified by substituting its components:





A
It is a first degree polynomial (aka linear because its highest power is 1) and it has two terms (2x and 8)
It does not have eight terms and is not a monomial (one term ie 3x^2)