Determine the appropriate rotation formulas to use so that the new equation contains no xy-term.- 
x2 + 7xy + 5y2 + 5
y + 39 = 0
A. x = 
(x' - 2y') and y = 
(2x' + y')
B. x = 
(x' + 2y') and y = 
(2x' - y')
C. x = 
(2x' + y') and y = 
(x' - 2y')
D. x = 
(2x' - y') and y = 
(x' + 2y')
Answer: A
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A. - 
B. - 
C. - 
D. - 
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= 6x5sec y
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