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Multiply. `( x^2-5 x+4)/( x^2-x-12) * ( x^2-9)/( x^2+x-2)`, `x!=1,4,-2`

State the product in simplest form.

`( x^2-5 x+4)/( x^2-x-12) * ( x^2-9)/( x^2+x-2)=`  
 


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