1/x.
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I suppose you mean what is an opposite reciprocal? At any rate, we should start there. The opposite reciprocal is -(1/x) so let's take the number 5. The opposite reciprocal would be -1/5. If you want two lines to be perpendicular you must take the original slope of the first line and change it to its opposite reciprocal. For example: y=5x A line perpendicular to this line would be y=-1/5x.
pi-4 is the opposite and 1/4-pi is the reciprocal
1/19 would be the reciprocal of 19. It's just the opposite.
the reciprocal is the opposite so it would be 6 over 1... 1/6= 6/1
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