X^20-1=0,how many real roots does each have
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Check the picture below.
notice, if we start checking its pattern from the 10th unit, backwards, it begins to repeat at the unit 4, namely, every 6 units.
Check the picture below.
notice, if we start checking its pattern from the 10th unit, backwards, it begins to repeat at the unit 4, namely, every 6 units.