Write the first four terms of the sequence.an = (-1)n+1
A. a1 = -1, a2 = 1, a3 = -1, a4 = 1
B. a1 = 1, a2 = 1, a3 = 1, a4 = 1
C. a1 = -1,a2 = -1, a3 = -1, a4 = -1
D. a1 = 1, a2 = -1, a3 = 1, a4 = -1
Answer: D
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A. 5 ln 2 ln cos 6
B. - 
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D. 
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B. 2 sin 4x
C. 
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?
?
(a) 
by 
.
?
(b) 
by 
.
What will be an ideal response?