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प्रश्न
Use a suitable identity to get the following products.
(a2 + b2) (− a2 + b2)
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उत्तर
(a2 + b2) (− a2 + b2) = (b2 + a2) (b2 − a2)
= (b2)2 − (a2)2 [(a + b) (a − b) = a2 − b2]
= b4 − a4
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