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November 17th, 2011, 10:59 AM  #1 
Member Joined: Aug 2011 From: Alabama Posts: 93 Thanks: 0  find inverse of inverse function
I have to find the inverse of . I know usually you just swap x's and y's, but I'm confused here.

November 17th, 2011, 11:58 AM  #2 
Math Team Joined: Sep 2007 Posts: 2,409 Thanks: 6  Re: find inverse of inverse function
Just undo it step by step. The reason this is the "inverse of inverse function" is that is the inverse of the tan function. If take the tangent of both sides: . Can you solve for x now?


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