Determine if the equation is an identity.sin(x + y) - sin(x - y) = -2 cos x sin y
A. Not an identity
B. Identity
Answer: A
Mathematics
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Use L'H
pital's rule to find the limit.
A. 
B. ?
C. 1
D. 0
Mathematics
Provide an appropriate response.The region bounded by the lines x = 2, x = 6, y = -2, and y = 1 is revolved about the y-axis to form a solid. Explain how you could use elementary geometry formulas to verify the volume of this solid.
What will be an ideal response?
Mathematics
Solve the formula for the indicated letter. Assume that all variables represent nonnegative numbers.A = 
?r2 for r
A. r = 
B. r = 
C. r = 
D. r = 3
Mathematics
Simplify. Assume that all variables represent positive real numbers.9
- 5x
A. 14
B. 4x
C. 9
- 5x
D. 4x
Mathematics