[tex]\displaystyle 1-x^2+2xh-h^2=1-(x^2-2xh+h^2)=1-(x-h)^2=(1-(x-h))(1+(x-h))=\\(1-x+h)(1+x-h)[/tex]
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[tex]\displaystyle 1-x^2+2xh-h^2=1-(x^2-2xh+h^2)=1-(x-h)^2=(1-(x-h))(1+(x-h))=\\(1-x+h)(1+x-h)[/tex]