The positive x axis in polar coordinates is called a pole
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Answer:
The answer is the last one.
A reciprocal is the number that is in front of a variable. If it is just the plain variable, it's reciprocal is 1. (Ex. 10x has a reciprocal of 10. 7y has a reciprocal of 7. Sorry if I didn't understand your question, are you looking for a vocabulary word?