\[\left|\frac{1}{x+1}\right|\]
\[\left\lfloor\frac{1}
{x+1}\right\rfloor\]
\[\left\lVert\frac{1}{x+1}\right\rVert\]
\[\left[\frac{1}{x+1}\right]\]
\[\left(\frac{1}{x+1}\right)\]