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exp(-x)

Limit of the function exp(-x)

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The solution

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      -x
 lim e  
x->oo   
$$\lim_{x \to \infty} e^{- x}$$
Limit(exp(-x), x, oo, dir='-')
Lopital's rule
There is no sense to apply Lopital's rule to this function since there is no indeterminateness of 0/0 or oo/oo type
The graph
Rapid solution [src]
0
$$0$$
Other limits x→0, -oo, +oo, 1
$$\lim_{x \to \infty} e^{- x} = 0$$
$$\lim_{x \to 0^-} e^{- x} = 1$$
More at x→0 from the left
$$\lim_{x \to 0^+} e^{- x} = 1$$
More at x→0 from the right
$$\lim_{x \to 1^-} e^{- x} = e^{-1}$$
More at x→1 from the left
$$\lim_{x \to 1^+} e^{- x} = e^{-1}$$
More at x→1 from the right
$$\lim_{x \to -\infty} e^{- x} = \infty$$
More at x→-oo
The graph
Limit of the function exp(-x)