factorise the following
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abc 0
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a^4b^4 -c^4
(a^2b^2)^2 - (c^2)^2
Using identity
(a^2b^2+c^2)(a^2b^2-c^2)
(a^2b^2)^2 - (c^2)^2
Using identity
(a^2b^2+c^2)(a^2b^2-c^2)
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