Use the sum/difference identities to simplify the expression. Do not use a calculator.cos (-15°) cos 75° + sin (-15°) sin 75°
A. 
B. -1
C. 0
D. 1
Answer: C
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Use the graph of population change per year for a metro area to answer the question. 
What is the difference of the 1998 and 1997 population changes?
A. 3797 B. 4843 C. -4843 D. -3797
Solve.The electric potential of an electric charge distributed along a straight wire of length L is given by the expression ln 
. Find three terms of the Taylor expansion of this expression in powers of (x - L).
A. ln 7 - 
(x - L) + 
(x - L)2 + . . .
B. ln 7 - 
(x - L) + 
(x - L)2 + . . .
C. ln 7 + 
(x - L) + 
(x - L)2 + . . .
D. ln 7 - 
(x - L) + 
(x - L)2 + . . .
Match the graph to one of the polar equations.
A. r = 
B. ? = 
C. r = -
D. ? = -
The graph of a function is given. Determine whether the function is increasing, decreasing, or constant on the given interval.(- 2, 0)
A. increasing B. constant C. decreasing