Find the potential function f for the field F.F = - 
i + 
j - 
k
A. f(x, y, z) = ln (y - x - z) + C
B. f(x, y, z) = 
- 
+ 
+ C
C. f(x, y, z) = 
+ C
D. f(x, y, z)= ln 
+ C
Answer: D
Mathematics
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B. 
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A. 
= 8?7 cos ? - ?8 sin ?
B. 
= 8?7 sin ?
C. 
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D. 
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A. -9 tanh (9x + 8)
B. 
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D. tanh (9x + 8)
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Find the inverse of the matrix (if it exists).A = 
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C. A-1 =
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