Find dy/dx of arcsin(1/x^4)
2. The solution
I've checked my answer to the above problem on WolframAlpha, and Wolfram states that the answer is "an alternate form assuming x is positive"
I guess this is more of a clarifying question, but what does Wolfram mean by that? As far as I understand, x doesn't need to be positive in order for the simplified solution to remain valid.