Perform the indicated operation and simplify.
? 
A. 
B. 
C. 
D. 
Answer: C
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Find Dxy.y = cosh-1 2
A. 
B. 
C. 
D. 
Describe the domain of the function of three or more varables.f(x1, x2, ..., xn) = 
A. All points in ?4 that satisfiy x12 + x22 + ... + xn2 ? 0. B. All points in ?n except the origin (0, 0, ..., 0). C. All points in ?4 that satisfy x1 > 0, x2 > 0, ..., xn > 0. D. All points in ?n.
Find all the second order partial derivatives of the given function.f(x, y) = xy2 + yex2 + 5
A. 
= 2yex2(1 + 2x2); 
= 2x; 
= 
= 2y + 2xex2
B. 
= 2yex2; 
= 2x; 
= 
= 2y + 2xex2
C. 
= yex2(1 + 2x2); 
= x; 
= 
= y + xex2
D. 
= 2yex2; 
= 2x; 
= 
= 2xex2
Provide an appropriate response.Define f(0,0) in such a way that extends f(x, y) = 
to be continuous at the origin.
A. No definition makes f(x, y) continuous at the origin. B. f(0, 0) = 2 C. f(0, 0) = 1 D. f(0, 0) = 0