Factorise the following
(i) x4 – y4
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Answer:
x^4 - y^4
(x^2)^2 - (y^2)^2
a^2 - b^2 = ( a+b )(a-b)
(x^2-y^2)(x^2+y^2)
(x+y)(x-y)(x^2+y^2) is your required answer
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