1 and 0. You can set this up as an algebra problem by realizing that x = 1/x. From there, multiply both sides by x, then take the square root of both sides.
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If you multiply two reciprocals, their product must be 1.
Reciprocals.
Two numbers are negative reciprocals if their product is -1. The numbers 1/2 and -2 are negative reciprocals. Their product is -1. This is often seen in problems involving the slopes of two lines. The slopes of perpendicular lines are negative reciprocals. Their product is -1.
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The numbers are negative reciprocals of each other.