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Question
Expand the following, using suitable identities.
(x2 + y2)(x2 – y2)
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Solution
We have,
(x2 + y2)(x2 – y2) = (x2)2 – (y2)2 ...[Using the identity, (a + b)(a – b) = a2 – b2]
= x4 – y4
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