Solve the problem.Find cos 
, given that sec ? = 4 and ? terminates in 0
A. 
B. 
C. 
D. 
Answer: A
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Provide an appropriate response.Evaluate 
Fill in the blank(s) with the appropriate word(s).
Find the indicated sum.
A. 71 B. 90 C. 33 D. 45
Express the product as a sum containing only sines or cosines.-2 sin (5?) sin ?
A. cos (6?) - cos (4?) B. cos (7?) + cos (3?) C. cos (7?) - cos (3?) D. cos (6?) + cos (4?)
Which technique ensures that personal characteristics that might affect the outcome of an experiment are scattered among research participants in the different groups, thereby making the groups roughly equivalent?
A. dependent recursion B. random assignment C. independent assignment D. regression to the mean