factorise xpower 4 - y power 4
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venky82:
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x4 -y4
(x ^2)^2 - (y ^2)2
(x2-y2) (x2+y2)
(x2+y2) (x+y) (x-y)
(x ^2)^2 - (y ^2)2
(x2-y2) (x2+y2)
(x2+y2) (x+y) (x-y)
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