Choose the expression with exactly the same value as the given expression.sin(-21°)
A. cos(69°)
B. sin(21°)
C. -cos(69°)
D. cos(-69°)
Answer: C
Mathematics
You might also like to view...
Using the graph below, find the domain and range of the given function, and sketch the graph. 
y = f(-x)
A. D: [-4, 5]; R: [-3, 3]
B. D: [-4, 5]; R: [-3, 3]
C. D: [-5, 4]; R: [-3, 3]
D. D: [-4, 5]; R: [-3, 4]
Mathematics
Graph the inequality.x + 5y ? -5
A. 
B. 
C. 
D. 
Mathematics
Simplify. Assume that all variables represent non-negative real numbers.
A. 2x5 B. 2x15 C. 8x5 D. 2x18
Mathematics
Rationalize the denominator.
A. 
B. 
C. 
D. -1
Mathematics