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The numbers are negative reciprocals of each other.
For example, the reciprocal of 3 is 1/3. Two numbers are reciprocals (each is the reciprocal of the other) if their product is 1.
The slope of parallel lines are the same, but the slope of perpendicular lines are negative reciprocals of each other.
Any two numbers whose product is '1' are each others' reciprocals.
Frequency and period are mutual reciprocals.