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The symbol for the square root of minus one was first introduced by:

AFermat
BNewton
CGauss
DEuler
Answer & Solution
Correct answer: D. Euler
1. The letter i is now standard for this quantity. 2. One mathematician first put it into use. 3. That was Euler. _Source: syllabus Mathematics, Chapter 5, Complex Numbers and Quadratic Equations._
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