Use a double-angle formula to rewrite the expression.
?
2 sin2 x - 1
?
A. cos x
B. cos 2x?
C. -2 cos x?
D. 2 cos 2x?
E. - cos 2x?
Answer: E
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Sketch D and g(D) from the description of D and change of variables 
x = 3u, y = 
v where D is the rectangle 0 ? u ? 2, 1 ? v ? 4 
?
A.
 ? |  |
B.
 ? |  |
C. None of these.
D.
 ? |  |
Change the order of integration and evaluate the integral.
A. 
?2
B. 
?2
C. 8?2
D. 
?2
Solve the problem using the rule of 78s.Dallas Wright took out a 48-month fixed installment loan of $6500 to purchase a new all-terrain vehicle (ATV). He began making monthly payments of $175.50. Instead of making his 27th payment, Dallas decides to repay his loan in full. How much interest will Dallas save?
A. $358.19 B. $377.93 C. $29.30 D. $1654.71
Find the probability.A digit is chosen randomly from the digits 0 through 9 and then 6 is added to the digit and the sum recorded. Find the probability that the sum is greater than 9.
A. 
B. 
C. 
D. 