Find the exact value of the expression.cos 
cos 
+ sin 
sin 
A. 
B. 
C. 1
D. 
Answer: B
You might also like to view...
Use the formula for 
to evaluate the expression.
A. 15 B. 30 C. 4 D. 180
Solve the problem.In the study of alternating electric current, capacitive voltage is given byVc = - 
cos 2?ft,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 = 
arccos 
C. t = 
arccos 
D. t = 2?f arccos 
Solve the rational inequality.3 + 
- 
? 0
A. (-?, -2] ? 
B. 
C. 
D. [-2, 0) ? 
Solve the problem. Round rates to the nearest tenth of a percent as necessary, amounts to the nearest dollar, and time to the nearest day.Sam Peters signs a $4200 note. His bank charges a 10% discount rate. Find the effective rate charged by the bank if the note is for 10 months.
A. 9.9% B. 10% C. 11% D. 10.9%