-x^3(1-x^2)^-1/2 - 2x(1-x^2)^1/2

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x^4

This is what I've been doing

-x^3(1-x^2)^-1/2 - 2x(1-x^2)^1/2 x (1-x^2)^1/2

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x^4 x (1-x^2)^1/2

-x^3-2x(1-x^2)

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x^4 <--------------- This is the part I'm stuck on!!!

How do you continue working this problem?? Thanks in advance for the help!!