Find all the second partial derivatives.z = ex/y
A. 
= 
; 
= 
; 
= 
= 
B. 
= 
; 
= ex/y
; 
= 
= -ex/y
C. 
= 
; 
= -ex/y
; 
= 
= ex/y
D. 
= 
; 
= ex/y
; 
= 
= -ex/y
Answer: D
Mathematics
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Perform the indicated operation and simplify if possible.
? (3x + 6)
A. 12 B. 5 C. 15 D. 3
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Find the exact value of the expression.cos 15° cos 45° - sin 15° sin 45°
A. 
B. 
C. 
D. 
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Find the solution to the system of equations by substitution.2x + 9y = -8 x + 
y = 
A. (5, -2) B. (-5, -2) C. (5, 2) D. (-5, 2)
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