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8.4 day one. Improper Integrals. Greg Kelly, Hanford High School, Richland, Washington. Sometimes we can find integrals for functions where the function or the limits are infinite. These are called improper integrals .

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8.4 day one

Improper Integrals

Greg Kelly, Hanford High School, Richland, Washington


Sometimes we can find integrals for functions where the function or the limits are infinite. These are called improper integrals.

Until now we have been finding integrals of continuous functions over closed intervals.


Example 1: function or the limits are infinite. These are called

The function is undefined at x = 1 .

Can we find the area under an infinitely high curve?

Since x = 1 is an asymptote, the function has no maximum.

We could define this integral as:

(left hand limit)

We must approach the limit from inside the interval.


Rationalize the function or the limits are infinite. These are called numerator.


This integral function or the limits are infinite. These are called converges because it approaches a solution.


Example 2: function or the limits are infinite. These are called

(right hand limit)

We approach the limit from inside the interval.

This integral diverges.


The function approaches function or the limits are infinite. These are called

when .

Example 3:


If then gets bigger and bigger as , therefore the integral diverges.

If then b has a negative exponent and ,

therefore the integral converges.

Example 4:

(P is a constant.)

What happens here?

p


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