Express the sum or difference as a product.cos 2x - cos 4x
A. cos (-2x)
B. 2 sin 3x sin x
C. -2 sin 3x sin x
D. -2 cos 3x sin x
Answer: B
Mathematics
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Find the limit if it exists.
(x + 1)2(x - 3)3
A. -1 B. 125 C. -9 D. 1125
Mathematics
Use logarithmic differentiation to find the derivative of y with respect to the independent variable.y = (x + 9)x
A. x ln(x + 9)
B. ln(x + 9) + 
C. x + (9)x-1
D. (x + 9)x
Mathematics
Solve the rational inequality. Express the solution in interval notation.
< 0
A. (6, ?) B. (-4, 6) C. (-?, -4) D. (-?, -4) ? (6, ?)
Mathematics
Match the system of inequalities with one of the graphs.x2 + y2 ? 81y ? 4x
A. 
B. 
C. 
D. 
Mathematics