Establish the identity.cos(x - y) - cos(x + y) = 2 sin x sin y
What will be an ideal response?
cos (x - y) - cos (x + y) = cos x cos y + sin x sin y - ( cos x cos y - sin x sin y) = 2 sin x sin y.
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Solve the problem.In how many ways can 6 tomatoes be lined up on a window sill?
A. 46,656 B. 720 C. 1 D. 6
Write the decimal in words.4.25
A. Four and twenty-five thousandths B. Four and twenty-five tenths C. Four and twenty-five millionths D. Four and twenty-five hundredths
Solve the system. 
+ 
- 
= 
- 
+ 
/> = - 
- 
+ 
- 
= 
A. 
B. {(-2, 1, 7)}
C. {(-2, 1, -7)}
D. 
Solve the problem. Round to the nearest hundredth of a percent.Frank wants money for 210 days to pay his credit card debt. His bank charges 11% simple discount rate. A second bank is offering a simple interest rate. What is the maximum simple interest he should accept so that he does not pay more than at his bank?
A. 10.69% B. 12.82% C. 11.75% D. 11.88%