\begin{deloppgaver}

  \delo
    \[ -135\degree \cdot \frac{\pi}{180\degree} \approx -2.35  \]

  \delo
    \[ 1,5\pi \cdot \frac{180\degree}{\pi} = 270\degree  \]

    \delo
    \[ sin\left( \frac{-\pi}{2} \right) = -1\]

    \begin{minipage}{0.42\textwidth}
      \begin{graphbox}
        \input{figures/1c.tex}
      \end{graphbox}
    \end{minipage}

\end{deloppgaver}