Find all the second order partial derivatives of the given function.f(x, y) = ln (x2y - x)
A. 
= 
; 
= 
; 
= 
= 
B. 
= 
; 
= - 
; 
= 
= - 
C. 
= 
; 
= - 
; 
= 
= - 
D. 
= 
; 
= - 
; 
= 
= - 
Answer: D
Mathematics
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Use the fact that the trigonometric functions are periodic to find the exact value of the expression. Do not use a calculator.sec 
A. 
B. -2
C. - 
D. -
Mathematics
Add or subtract as indicated. Then simplify your answer if possible. Leave the answer in terms of sin ? and/or cos ?.
?
?
A. 
B. ?
C. ?
D. ?
E. ?
Mathematics
Choose the expression which is equivalent to the given expression.1 - cos2 13°
A. cos2 26° B. cos 26° C. sin2 13° D. sin 26°
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Perform the indicated operation.
A. -29
B. 29
C. - 
D. 
Mathematics