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No, the product of reciprocals is 1.
No, the Sum of two reciprocals isn't 1. However, the PRODUCT of two reciprocals is 1. For example, if you multiply 1/2 with 2/1, you'd multiply the two numeraters, which would be 1X2=2, and the two denominators, which is 2X1=2. this would cause the answer to be 2/2, or 1.
If you have two lines that have negative recipricals (1 and -1 for example), the lines are perpendicular.
They can be written as reciprocals with positive exponents. For example, 5-7 = (1/5)7
If you multiply two reciprocals, their product must be 1.