Express the sum or difference as a product of sines and/or cosines.cos (6?) + cos (4?)
A. 2 cos (5?) cos ?
B. 2 cos (5?)
C. 2 sin (5?) sin ?
D. 2 cos (5?) sin ?
Answer: A
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The present value of $500,000 received at the end of five years discounted at 10% is
A. $805,255. B. $310,461. C. $306,957. D. none of these
Find the exact value under the given conditions.cos ? = 
, 0 < ? < 
; sin ? = - 
, - 
< ? < 0Find tan(? + ?).
A. 
B. 
C. 
D. 
Find the exact solution of the equation.cos-1 x = 0
A. x = 0 B. x = -1 C. x = ? D. x = 1
Write the first five terms of the arithmetic sequence with the given first term a and common difference d.a = 4; d = 5
A. 4, 8, 12, 16, 20 B. 4, 9, 14, 19, 24 C. 9, 14, 19, 24, 29 D. 0, 4, 9, 14, 19