Which answer choice is equivalent to the given expression?cos2x - sin2x
A. 3 tan2x
B. csc2x
C. 1
D. 2 cos2x - 1
Answer: D
Mathematics
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Let U = {1, 2, 4, 5, a, b, c, d, e}. Find the complement of the set.T = U
A. T B. {U - T'} C. ? D. U
Mathematics
Factor completely. If unfactorable, indicate that the polynomial is prime.x2 + 12x + 36
A. (x + 6)(x - 6) B. (x + 6)2 C. (x - 6)2 D. prime
Mathematics
Decide whether or not the functions are inverses of each other.f(x) = 9x - 8, g(x) = 
A. Yes B. No
Mathematics
Find the vertex and axis of symmetry of the graph of the function.f(x) = -x2 + 8x
A. (4, 16); x = 4 B. (-4, -16); x = -4 C. (-16, 4); x = -16 D. (16, -4); x = 16
Mathematics