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Mathematics 12 Online
OpenStudy (anonymous):

I have the same exact question as the one located here: http://openstudy.com/updates/505e3de2e4b02e139410234c The answer at the very bottom is correct, however I have no idea how I would know f^-1(4)=0. Please help if you can.

OpenStudy (anonymous):

Nevermind. I feel so stupid now lol

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