trig representation

[DrD]

(10-06-2017 03:43 PM)parisse Wrote:  The best way to check a result obtained by hand with the calc answer is check if simplify of the difference returns 0.

I'm having trouble with this one, and it may be something I have overlooked:

(int(x*sec(x^2),x)) - ((1/2)*ln(ABS(sec(x^2)+tan(x^2))) ); // Doesn't return 0.

This is merely the difference between the integral result and the result obtained by hand. If I haven't made an error, is the difference due to round off or something?

The calc results are rather obscure, and I don't readily see the hand result matching the calc result.