\documentclass{standalone}
\usepackage{amsmath,amssymb,mathrsfs}
\standaloneconfig{border=2mm 2mm 2mm 2mm}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\definecolor{left}{HTML}{f00000}

\begin{document}

\begin{tikzpicture}
  \node[] at (2,6.5) {$16\sin^3(t)$};
    \node[] at (3,6) {$13\cos(t)-5\cos(2t)-2\cos(3t)-\cos(4t)$};
    \begin{axis}[axis lines=none]
        \addplot[
            shading=axis,rectangle,
            left color=left,
            right color=left!30!white,
            shading angle=135,
            very thick,
            variable=t,
            domain=0:360,samples=150] (
            {16*sin(t)*sin(t)*sin(t)},
            {13*cos(t)-5*cos(2*t)-2*cos(3*t)-cos(4*t)});
    \end{axis}
\end{tikzpicture}

\end{document}

    
\documentclass{standalone}
\usepackage{amsmath,amssymb,mathrsfs}
\standaloneconfig{border=2mm 2mm 2mm 2mm}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\definecolor{left}{HTML}{f00000}

\begin{document}

\begin{tikzpicture}
  \node[] at (2,6.5) {$16\sin^3(t)$};
    \node[] at (3,6) {$13\cos(t)-5\cos(2t)-2\cos(3t)-\cos(4t)$};
    \begin{axis}[axis lines=none]
        \addplot[
            shading=axis,rectangle,
            left color=left,
            right color=left!30!white,
            shading angle=135,
            very thick,
            variable=t,
            domain=0:360,samples=150] (
            {16*sin(t)*sin(t)*sin(t)},
            {13*cos(t)-5*cos(2*t)-2*cos(3*t)-cos(4*t)});
    \end{axis}
\end{tikzpicture}

\end{document}