4.Sketch the graphs of the following two functions including
all the critical points,extremal values(local and global),
inflection points,concavity and horizontal,vertical and/or
oblique asymptotic lines.
4 3
(a) f(x)=x -4x +1 with x屬於[-1,5).
3
x
(b) f(x)=-------- with x屬於(-無限,無限)\{1}
2
(x-1)
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