How do you close question
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ANSWER
B) 15
EXPLANATION
The given polynomial is
We arrange this polynomial in ascending powers of x to obtain the standard form;
The degree of this polynomial is 6.
The coefficient of the leading term is 15
cosx = +1/2 => x = +π/3 + 2kπ, where k is an integer or x = -π/3 + 2kπ, where k is an integer;
cosx = -1/2 => x = +2π/3 + 2kπ, where k is an integer or x = -2π/3 + 2kπ, where k is an integer;