Intergration by Substition Formula compared to Symbolic Algebra Software Answer

For

I got the answer by substitution into a formula:

By using Maple (symbolic algebra software) I got:-

Can anyone help me explain the difference in the two answers?

Re: Intergration by Substition Formula compared to Symbolic Algebra Software Answer

if ,

so,

... in other words, they are two expressions for the same angle.

Re: Intergration by Substition Formula compared to Symbolic Algebra Software Answer

Brilliant!! Thank you so much!

Re: Intergration by Substition Formula compared to Symbolic Algebra Software Answer