Oh you're right, totally forgot to derivate the X2 + X factor in the arctan, given that you have to treat the equation as being arctan (u) with a derivative as follows
(arctan (u) ) ' = u' / (1 + u2)
thanks for pointing that to us ;)
Well i don't have a minor nor a degree in maths, i'm a biochemistry student, and it was only in my first year that we had calculus (or applied maths I, II and Linear Algebra and Geometrical Analysis in my university), so my math skills are a bit rusty, as it was shown solving that other problem :P.
Hope the problems keep on coming ;) need to brush up these math skills
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