Use Identities to find the exact value.cos 
A. 
B. 
C. 
- 
D. -
- 
Answer: A
Mathematics
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Find all complex zeros of the polynomial function, and write the polynomial in completely factored form.f(x) = x4 + 5x3 + 15x2 + 45x + 54
A. f(x) = (x - 1)(x - 6)(x - 3i)(x + 3i)
B. f(x) = (x + 2)(x + 3)(x - 3i)(x + 3i)
C. f(x) = (x - i
)(x + i
)(x - 3)(x +3)
D. f(x) = (x - 2)(x + 3)(x - 3)(x + 3)
Mathematics
Find the exact value of y, or state that y is undefined.y = sec-1 (-1)
A. 
B. ?
C. 0
D. 2?
Mathematics
Solve the system of equations by either the addition method or the substitution method.
A. (9.6, -18) B. (-18, 9.6) C. infinite number of solutions D. no solution
Mathematics
Solve the absolute value equation.
= |7x + 9|
A. x = - 
, - 
B. no solution
C. x = - 
, - 
D. x = 1, 
Mathematics