\begin{frame}
  \frametitle{Derivatives of Trigonometric Functions}

  \begin{block}{}
    \begin{malign}
      \frac{d}{dx} \sin x &= \cos x &&
      \frac{d}{dx} \cos x = -\sin x
    \end{malign}
  \end{block}
  \pause\medskip
  
  \begin{exampleblock}{}
    Differentiate 
    \begin{talign}
      f(x) = x^2 \sin x
    \end{talign}
    \pause\medskip
    We have 
    \begin{talign}
      f'(x) 
      &= \mpause[1]{ x^2 \frac{d}{dx}\sin x + \sin x \frac{d}{dx} x^2 \quad\text{\textcolor{gray}{product rule}} } \\
      &\mpause[2]{= x^2 \cos x + 2x \sin x} 
    \end{talign}
  \end{exampleblock}
  \vspace{10cm}
\end{frame}