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February 1, 2015

February 1, 2015

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

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?

- calculus -
**mathstudent**, Monday, December 31, 2007 at 3:59pmsorry. posted too quickly. got the answer.

Via trig substitution answer comes to:

ln|sqrt(x^2+4)/2| + c

which is the same as the other answer

- calculus -
**Damon**, Monday, December 31, 2007 at 4:35pmYes, good!

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