+0  
 
+1
109
1
avatar+222 

Thanks!

 Apr 13, 2021
 #1
avatar+121004 
+1

Note  that  the point  (3.4) is  on  f

 

The  inverse  reverses  the coordinates....so  ( 4,3)  is on the  inverse

 

Which  implies  that  f-1 (4)   =   3

 

 

cool cool cool

 Apr 13, 2021

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