Factorise a^8 - y^8.
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Refer to attatchment please.
Concept : a^4 + b^4 = (a^2+b^2)^2 - 2a^2b^2
Because, a^4 + b^4 + 2a^2b^2 - 2a^2b^2
And we will get, a^4 + b^4 again.
Morover, 2a^2b^2 can be written as
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