Ir ao conteúdo principal\(\newcommand{ct}[1]{\color{gray}{\text{#1}}}
\newcommand{ctm}[1]{\color{gray}{#1}}
\newcommand{\doubler}[1]{2#1}
\newcommand{\dd}{\mathrm{d}}
\newcommand{\ob}[2]{\color{gray}{\overbrace{\color{black}{#1}}^{#2}}}
\newcommand{\ub}[2]{\color{gray}{\underbrace{\color{black}{#1}}_{#2}}}
\newcommand{\integral}[2]{\displaystyle\int {#1}\,\dd {#2}}
\newcommand{\integrald}[4]{\displaystyle\int_{#2}^{#3} {#1}\,\dd {#4}}
\DeclareMathOperator{\arcsec}{arc \,sec}
\DeclareMathOperator{\sin}{sen}
\DeclareMathOperator{\arcsin}{arc \,sen}
\DeclareMathOperator{\arccos}{arc \,cos}
\DeclareMathOperator{\csc}{cossec}
\DeclareMathOperator{\tan}{tg}
\DeclareMathOperator{\arctan}{arc\,tg}
\DeclareMathOperator{\cot}{cotg}
\newcommand{\lt}{<}
\newcommand{\gt}{>}
\newcommand{\amp}{&}
\definecolor{fillinmathshade}{gray}{0.9}
\newcommand{\fillinmath}[1]{\mathchoice{\colorbox{fillinmathshade}{$\displaystyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\textstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptscriptstyle\phantom{\,#1\,}$}}}
\)
Aqui uma introdução será necessária
