Decide whether the equation is or is not an identity.sin (? + 4?) = cos (? + ?)
A. Not an identity
B. Identity
Answer: A
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Solve the problem.Use a tree to show the parent-child relationships in the following family. Elizabeth has three children: Harold, Lauren, and Sybil. Harold has two children: John and Nigel. Lauren has two children: Bret and Gail. Sybil has four children: Susan, Diane, Mark, and Zoe.
A. 
B. 
C. 
D. 
Solve the problem.Determine the period and frequency of oscillation when a pendulum of length 9 feet is released after being displaced 2 radians. Round constants to 8 decimal places, if necessary.
A. Period = 2?
sec, frequency = 
cycles per sec
B. Period = 2?
sec, frequency = 
cycles per sec
C. Period = 9? sec, frequency = 
cycles per sec
D. Period = 
sec, frequency = 
cycles per sec
Find the derivative of the function at the given point in the direction of A.
A. 
B. 
C. 
D. 
Factor the polynomial as the sum or difference of two cubes.x3 - 27
A. (x - 3)(x2 + 3x + 9) B. (x + 27)(x2 - 1) C. (x - 3)(x2 + 9) D. (x + 3)(x2 - 3x + 9)