## Intermediate Algebra (6th Edition)

The reciprocal of a number $a$ is the number$\frac{1}{a}$, such that $a\times\frac{1}{a}=1$. $a=1$, so $\frac{1}{a}=\frac{1}{1}=1$ $1\times1=1$, therefore the reciprocal of 1 is also 1.