Establish the identity.sin (x + y) - sin (x - y) = 2 cos x sin y
What will be an ideal response?
sin (x + y) - sin (x - y) = sin x cos y + cos x sin y - sin x cos y + cos x sin y = 2 cos x sin y.
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Decide whether the statement makes sense. Explain your reasoning.Jose's car gets about 20 miles to the gallon. He is thinking of buying a new fuel-efficient car which gets 
miles to the gallon and which costs $25,000. He reasons in this way: " I drive about 300 miles per week. Gas costs about $3.50 per gallon. That means I'll save $1365 per year on gas. That means that if gas remains at $3.50 per gallon it will be about 18 years before the car has paid for itself. I don't think I can justify buying the new car. "
What will be an ideal response?
Answer the question.You could take a 15-week, three-credit college course, which requires 11 hours per week of your time and costs $600 per credit-hour in tuition. Or during those hours you could have a job paying $14 per hour. What is the net cost of the class compared to working?
A. $4110 B. $754 C. $1954 D. $2910
Establish the identity.cot ( x + y) cot (x - y) = 
What will be an ideal response?
Use the information given about the angle ?, 0 ? ? ? 2?, to find the exact value of the indicated trigonometric function.sec ? = - 
, csc ? > 0Find sin (2?).
A. 
B. 
C. 
D. - 