Write down the following products:
(3 - x2)(5 + x2)
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Given,
⇒ (3 - x2)(5 + x2)
⇒ (15 + 3x2 - 5x2 - x4)
⇒ (15 - 2x2 - x4).
Hence, (3 - x2)(5 + x2) = (15 - 2x2 - x4).
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