Plot Curves: Package pgfplots
@Code \documentclass{standalone}
@Code \usepackage{pgfplots}
@Code \begin{document}\begin{tikzpicture}
@Code \draw[variable=\x,domain=-1:1] plot ({\x},{ -\x*\x+1 });
@Code %...
@Code \end{tikzpicture}
@List [a-z].html
\[
a \leq xy \leq b
\wedge
\alpha \leq xy^3 \leq \beta
\]
@Image Fig.svg
@Code Fig.tikz.tex height=300px
@Image Fig.png
Image in PNG