Use a half-angle formula to find the exact value of the expression.cos 
A. - 
B. - 
C. 
D. 
Answer: C
Mathematics
You might also like to view...
Solve the problem.The weight that a horizontal beam can support varies inversely as the length of the beam. Suppose that a 10-m beam can support 270 kg. How many kilograms can a 5-m beam support?
A. 0.1852 kg B. 0.0019 kg C. 5.4 kg D. 540 kg
Mathematics
Determine whether the functions f and g are inverses of each other.f(x) = x3 + 2; g(x) = 
A. Yes B. No
Mathematics
Simplify. Be sure to rationalize the denominator. Assume that all variables represent positive real numbers.
A. 
B. 4
C. 4
D. 
Mathematics
Solve the equation.y + 9.2 = -4.5
A. -4.7 B. 13.7 C. 4.7 D. -13.7
Mathematics