71.
As x increased from \[ - \infty \]  to \[\infty \] , the function \[{\rm{f}}\left( {\rm{x}} \right) = \frac{{{{\rm{e}}^{\rm{x}}}}}{{1 + {{\rm{e}}^{\rm{x}}}}}\]

76.
A sphere of unit radius is centered at the origin. The unit normal at a point (x, y, z) on the surface of the sphere is the vector

79.
The value of the function \[{\text{f}}\left( {\text{x}} \right) = \mathop {\lim }\limits_{{\text{x}} \to 0} \frac{{{{\text{x}}^3} + {{\text{x}}^2}}}{{2{{\text{x}}^3} - 7{{\text{x}}^2}}}\]    is

80.
Consider the function f(x) = |x|3, where x is real. Then the function f(x) at x = 0 is

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