Identify the equation as either an identity or not.sin (A + B) sin (A - B) = sin2A - sin2B
A. Not an identity
B. Identity
Answer: A
Mathematics
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Find all the second order partial derivatives of the given function.f(x, y) = x ln (y - x)
A. 
= 
; 
= - 
; 
= 
= 
B. 
= 
; 
= 
; 
= 
= 
C. 
= 
; 
= - 
; 
= 
= - 
D. 
= 
; 
= - 
; 
= 
= 
Mathematics
Find a formula for the nth partial sum of the series and use it to find the series' sum if the series converges.
+ 
+ 
+ ... + 
+ ...
A. 
; 
B. 
; 
C. 
; 
D. 
; 
Mathematics
Use the information below to determine the indicated set. U = {x | x ? N and x ? 12} A = {x | x ? N and 6 < x < 12} B = {x | x ? N and x is even and x < 12}(A ? B) ? A'
A. {2, 4, 6, 7, 8, 9} B. { } C. {2, 4, 6} D. {1, 2, 4, 6, 12}
Mathematics
Find the limit, if it exists.
A. 
B. -?
C. 0
D. 
Mathematics