Use the fundamental identities and appropriate algebraic operations to simplify the expression. 
A. 1
B. -1
C. cos2 x
D. sin2 x
Answer: D
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Solve the linear equation.-8b + 7 + 6b = -3b + 12
A. -7 B. 5 C. 12 D. -12
Solve the linear inequality. Graph the solution set on a number line, and express the solution using interval notation.
x ? 5 + 
x
A. [18, ?)
B. (-?, 18]
C. (18, ?)
D. [-18, ?)
Find the exact value by using a half-angle identity.tan 
A. 2 + 
B. -2 + 
C. -2 - 
D. 2 - 
Without graphing, determine the number of solutions of the system of equations. State whether the system is consistent or inconsistent. For a system that is consistent, state whether the equations are dependent or independent.
A. infinitely many solutions; consistent; dependent B. one solution; consistent; dependent C. no solution; inconsistent D. one solution; consistent; independent