Sine and Cosine Plot

\usepackage{pgfplots}
\pgfplotsset{compat=1.17}

\begin{tikzpicture}
  \begin{axis}[
    xlabel=$x$, ylabel=$y$,
    domain=-2*pi:2*pi,
    samples=100,
    legend pos=north west,
    grid=major
  ]
    \addplot[blue, thick] {sin(deg(x))};
    \addplot[red, thick, dashed] {cos(deg(x))};
    \legend{$\sin(x)$, $\cos(x)$}
  \end{axis}
\end{tikzpicture}