How do you factor #x^4-1#?

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Emy S. Share
May 2, 2015

Difference of two squares can be factored by the sum and difference of their square roots:
#(x^2-1)(x^2+1)#
Another diff. of 2 squares: #(x^2-1)#
#(x+1)(x-1)(x^2+1)#

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