Use the derivative of 
to determine any points on the graph of 
at which the tangent line is horizontal.
A. 
B. 
and 
C. 
and 
D. (0,0)
E. f(x) has no points with a horizontal tangent line.
Answer: E
Mathematics
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A. 1
B. 
C. 0
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+ 
A. 
B. 
C. 11
D. 
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A. 9 < 0 B. 9 > 0
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