1. If |x + 1| < 1/10, prove that |x^3 + 1| < 0.331. If |x + 1| < δ, prove |x^3 + 1| < 7δ
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1. If |x + 1| < 1/10, prove that |x^3 + 1| < 0.331. If |x + 1| < δ, prove |x^3 + 1| < 7δ
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