(x^2 + y^2)(x^2 - y^2) expand it using the suitable identities

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Solution

$(x^{2} + y^{2}) (x^{2} - y^{2}) = (x^{2} + y^{2}) (x + y) (x - y) [using a^{2} - b^{2} = (a + b) (a - b)]$

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Question 85 (xii)

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