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## Homework Statement

Find dy/dx of arcsin(1/x^4)

**2. The solution**

Answer simplified:

-4/(x*sqrt(x^8-1))

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.