Identify ? and ? in the following expression which is the right side of the formula for cos (? - ?).cos 
cos 
+ sin 
sin 
A. ? = 
, ? = 
B. ? = 
, ? = - 
C. ? = - 
, ? = 
D. ? = 
, ? = 
Answer: D
Mathematics
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Multiply and simplify.
? 
A. 
B. 
C. 
D. 8z
Mathematics
Solve the problem.Find the nth term of the following arithmetic sequence:1, -1, -3, -5, -7, . . .
A. -2n - 3 B. -2n + 3 C. 2n - 3 D. -5 - 2n
Mathematics
Solve the problem.In the study of alternating electric current, capacitive voltage is given by 
, where f is the number of cycles per second, i is the maximum current, and t is the time in seconds. Solve the equation for t.
A. t = 2?f cos 
B. t = 2?f arccos 
C. t = 
arccos 
D. t = 
arccos 
Mathematics
Simplify the expression.
A. 1
B. 1 - x2
C. 
D. 
Mathematics