Express the product as a sum containing only sines or cosines.sin(9?) cos(5?)
A. 
[sin(14?) + sin(4?)]
B. 
[cos(14?) - cos(4?)]
C. sin cos(45?2)
D. 
[sin(14?) + cos(4?)]
Answer: A
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Solve the problem. Round your answer, if appropriate.Boyle's law states that if the temperature of a gas remains constant, then PV = c, where 
, 
, and c is a constant. Given a quantity of gas at constant temperature, if V is decreasing at a rate of 13 in. 3/sec, at what rate is P increasing when P = 70 lb/in.2 and V = 50 in.3? (Do not round your answer.)
A. 
lb/in.2 per sec
B. 
lb/in.2 per sec
C. 
lb/in.2 per sec
D. 
lb/in.2 per sec
Solve. Round to the nearest tenth if necessary.The enrollment at a local college decreased 2% from last year's enrollment of 500. How many fewer students attended the school this year?
A. 490 students B. 510 students C. 100 students D. 10 students
Find the exact value of the expression or state that it does not exist.cos
A. 
B. 0
C. 1
D. 
Solve the problem.An airplane is cruising at an altitude of 44,880 ft. What is the plane's altitude in miles?
A. 8.5 mi B. 7.5 mi C. 9.5 mi D. 17 mi