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is a function such 
, for all x. In practice, to find the inverse function, we just have to swich "x" by "y" in  the original function, and clear  y, which would be the inverse funtion.In this case, 
. Then, if we swich x by y, we have the following expression: 
. Now, we just have to clear  y, as a function of x, by doing the following: Add 2 both sides of the equation. This would yield 
.Take square root both sides of the equation. This would yield 
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Graph the function and its inverse f(x)=x^2-4...
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