Latex tables

• How to Make a Variation Table and Graph of ln(x) in TikZ
  Build a LaTeX variation table for ln(x) and plot its graph with TikZ and PGFPlots using a complete example, with domain and monotonicity notes.
• How to Make a LaTeX Table with Grouped Headers and a Total Row
  Use \multicolumn for grouped LaTeX headers, \cmidrule to mark their spans, and a final row of column sums for a clean total line.