Posted by **mathstudent** on Monday, December 31, 2007 at 3:52pm.

Integrate x/(x^2 + 4) dx via trig substitution and by u=x^2+4 substitution. Show that results are equal.

Via trig substitution of x=2 *tan t, I get:

1/2 * tan^-1 (x/2) + c

Via u = (x^2 + 4) substitution, I get:

1/2 * ln |x^2 + 4| + c

How are these equal?

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