Complete the identity.sin ? cos3 ? + sin3 ? cos ? = ?
A. 
sin (2?)
B. 
sin2 (2?)
C. 
sin (2?) cos (2?)
D. 
sin (3?) sin (2?)
Answer: A
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Solve the problem.Suppose that the manufacturing cost of a precision instrument is approximated by 
where x is the cost of materials and y is the cost of labor. Find 
A. 108 B. 354 C. 144 D. 1044
Establish the identity.cos(3x) = cos3 x - 3 sin2 x cos x
What will be an ideal response?
Solve the problem.A company estimates that it will sell N(t) hair dryers after spending $t thousands on advertising as given by: N(t) = -3t3 + 450t2 - 21,600t + 1,100,40 ? t ? 60For which values of t is the rate of sales N'(t) increasing?
A. 50 < t < 60 B. t > 40 C. 40 < t < 60 D. 40 < t < 50
A movie theater would like to use a survey to determine which factors are most important to those who come to their theater. Which of the following procedures would be most appropriate for obtaining a statistically unbiased sample? ? A. Survey a random selection of people passing by the theater in the mall in front of the theater. B. Survey a random selection of shoppers in the mall. C. Survey a random selection of people who are leaving the theater after watching a movie. D. Induce people to answer survey questions by offering discount coupons for various city events, including the movie theater.
What will be an ideal response?