# What's wrong with this solution of tan^3x?

1. Mar 1, 2008

### p3t3r1

I don't see what I am doing wrong in this. The answer I got is obviously not right. Appreciate any help. Thanks!

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2. Mar 1, 2008

### nicksauce

Why is the answer you got obviously not right? I would say it is right.

3. Mar 1, 2008

### p3t3r1

Cause the answer is suppose to be 1/2(tanx)^2 -ln(secx)

4. Mar 1, 2008

### nicksauce

so tanx^2 = secx^2 -1, and the -1 gets absorbed into the constant of integration.

5. Mar 1, 2008

### p3t3r1

Oh, yeah that would make sense. Is quite odd how two different things are exactly the same when you integrate them. Thanks.