∣x2−1∣<21100\left|x^{2}-1\right|<\frac{21}{100}x2−1<10021
∣x3−1∣<21100\left|x^{3}-1\right|<\frac{21}{100}x3−1<10021
∣x2−1∣<1100\left|x^{2}-1\right|<\frac{1}{100}x2−1<1001
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