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PROOF:

so that

But In a is a constant, so

Then, by dividing both sides by In a:

or

where

EXAMPLE: Evaluate

SOLUTION: Let

so that

Therefore, by knowing that

and using substitution, we find that

EXAMPLE: Evaluate

SOLUTION. Let

so that

The integral should contain a factor of 2. Thus we insert a factor of 2 in the integral and compensate by multiplying the integral by 1/2.

Then,

Therefore,

EXAMPLE: Evaluate

SOLUTION: Let

so that

We find we need 2x dx; therefore, we remove the 7 and insert a 2 by writing

PRACTICE PROBLEMS: Evaluate the following integrals:

ANSWERS:




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