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प्रश्न
Take 1 − a + a2 from a2 + a + 1.
योग
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उत्तर
(a2 + a + 1) − (1 − a + a2)
= a2 + a + 1 − 1 + a − a2
= a2 − a2 + a + a + 1 − 1
= 2a
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