Is:
The same as:
I am having real problems with double angle formulas and integration.
Hope someone can answer this for me?
My function to integrate (don't know how to do integral symbol on here)
Use this double angle formula:
Rearranged:
Substitute values:
Evaluate:
Integrate:
Simplify:
You had the correct answer in the second last line of that other post. Nothing else you have written after it is correct. So that I am not repeating myself, I will say take much greater care with your basic algebra.
(I just do not understand how you can possibly propose this or the other final answer as being equivalent to that correct second last line)