Identify the equation as either an identity or not.sin2x - sin2y = cos2y - cos2x
A. Identity
B. Not an identity
Answer: A
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Solve the problem.Bob is 72 years old and Susan is 45 years old. Write a simplified ratio in three different ways of Bob's age to Susan's age.
A. 
, 5 to 8, 5:8
B. 
, 8 to 5, 8:5
C. 
, 1 to 9, 1:9
D. 
, 72 to 45, 72:45
Use the graph of the function f(x) to locate the local extrema and identify the intervals where the function is concave up and concave down.
A. Local minimum at x = 3; local maximum at x = -3 ; concave up on (0, -3) and (3, ?); concave down on (-3, 3) B. Local maximum at x = 3; local minimum at x = -3 ; concave up on (0, -3) and (3, ?); concave down on (-3, 3) C. Local minimum at x = 3; local maximum at x = -3 ; concave up on (0, ?); concave down on (-?, 0) D. Local minimum at x = 3; local maximum at x = -3 ; concave down on (0, ?); concave up on (-?, 0)
Use the graph to determine where the function is discontinuous. Select the correct answer.
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Multiply. Simplify, if possible.- 
A. - 
y
B. - 
y
C. 
y
D. 
y