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Multiply. `( x^2-5 x+4)/( x^2-6 x+8) * ( x^2+x-6)/( x^2-1)`, `x!=1,4,-1`

State the product in simplest form.

`( x^2-5 x+4)/( x^2-6 x+8) * ( x^2+x-6)/( x^2-1)=`  
 


Enter the numerator and denominator separately in the boxes above. If the denominator is 1, enter the number 1. Do not leave either box blank.