(adsbygoogle = window.adsbygoogle || []).push({}); How do i differentiate something like 12/(x^+3)??2

I am acquainted with differentiating equations like (2x+5)^2 ( by chain rule and the direct method). But how do i go about with the equation 12/(x^2+3)? The specific doubt is that the answer given -12(x^2+3)^-2 into(multiplied by) 2x. Im getting the answer, but its not multiplied by 2x, so i get -12(x^2+3)^-2. I dont know why

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# How do i differentiate something like 12/(x^+3)?2

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