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प्रश्न
Multiply: x2+ x + 1 by 1 − x
उत्तर
(x2+ x + 1) (1 − x) = 1(x2 + x + 1) − x(x2 + x + 1)
= x2 + x + 1 − x3 − x2 − x
= 1 − x3
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