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I want to write everything in math mode as bold characters. I know that with bm package I can do that. Here is my example code.

\documentclass{article}
\usepackage{bm,amsmath}

\begin{document}
$E = \frac{1}{2} mv^2$. \newline
\begin{equation}
E =mc^2
\end{equation}
\begin{align}
\tan x = \frac{\sin x}{\cos x} 
\end{align}


\hrule
% I don't want to use \bm{} everytime.
$\bm{E = \frac{1}{2} mv^2}$. \newline
\begin{equation}
\bm{E =mc^2}
\end{equation}
\begin{align}
\bm{\tan x = \frac{\sin x}{\cos x}} 
\end{align}

\end{document}

I don't want to write \bm{} for every mathematical expression. I want bold characters whenever I write any mathematical expression inside $$ or \begin{equation}...\end{equation}. Is there any way around?