The total number of parallel tangents of\[{{f}_{1}}(x)={{x}^{2}}-x+1\] and \[{{f}_{2}}(x)={{x}^{3}}-{{x}^{2}}-2x+1\] is

The total number of parallel tangents of\[{{f}_{1}}(x)={{x}^{2}}-x+1\]

1.	The total number of parallel tangents of\[{{f}_{1}}(x)={{x}^{2}}-x+1\] and \[{{f}_{2}}(x)={{x}^{3}}-{{x}^{2}}-2x+1\] is
A.	2
B.	0
C.	1
D.	Infinite
Answer» E.

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The total number of parallel tangents of\[{{f}_{1}}(x)={{x}^{2}}-x+1\] and \[{{f}_{2}}(x)={{x}^{3}}-{{x}^{2}}-2x+1\] is

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