Write down the following products:
(x2 + 1)(x2 + 2)
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Given,
⇒ (x2 + 1)(x2 + 2)
⇒ (x4 + 2x2 + x2 + 2)
⇒ (x4 + 3x2 + 2).
Hence, (x2 + 1)(x2 + 2) = (x4 + 3x2 + 2).
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