SOLUTION: Which of the following integrals cannot be evaluated using a simple substitution? the integral of 1 divided by the quantity x squared plus 1, dx the integral of 1 divided b

Question 1025361: Which of the following integrals cannot be evaluated using a simple substitution?
the integral of 1 divided by the quantity x squared plus 1, dx
the integral of 1 divided by the quantity x squared plus 1, dx
the integral of x divided by the quantity x squared plus 1, dx
the integral of x cubed divided by the quantity x to the 4th power plus 1, dx
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
The last two can be evaluated using simple substitution. (Let the denominator be equal to w, or z, say.)
The first (two??) doesn't require substitution, however.
(Note: = , and doesn't require SIMPLE substitution although some people who like to split hairs may say let w = , for example.)
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