Find the reference angle for the given angle.
A. 
B. 
C. 2?
D. - 
Answer: A
Mathematics
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Solve.Find an equivalent expression for cos3 x in terms of function values of x, 2x, or 3x, raised only to the first power.
A. 
cos x + 
cos 3x
B. 
cos x - 
cos 3x - cos 2x
C. 
cos x + 
cos 3x + cos 2x
D. 
cos x - 
cos 3x
Mathematics
Find the mean. If necessary, round to one decimal place.57, 38, 87, 23, 133, 89
A. 71.2 B. 85.4 C. 70.7 D. 71.7
Mathematics
Write the sum using summation notation.0 + 1 + 2 + 3 + 4
A. 
B. 
C. 
D. 
Mathematics
Find the vertical asymptote(s), if any, of the graph of the rational function. f(x) = 
A. no vertical asymptote B. x = -9 C. x = 1, x = -1 D. x = 9
Mathematics