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How do I do this?

[tex] \int {\frac {1} {(\sqrt {-x})}} dx [/tex]

I got [tex] 2 \sqrt {-x} [/tex] but my teacher got [tex] -2 \sqrt {-x} [/tex] and I don't know how he got there.

[tex] \int {\frac {1} {(\sqrt {-x})}} dx [/tex]

I got [tex] 2 \sqrt {-x} [/tex] but my teacher got [tex] -2 \sqrt {-x} [/tex] and I don't know how he got there.

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