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unicode2latex
Gem for translating UTF8 Unicode characters to LaTeX escapes
require "unicode2latex"
latex = 'M =
\begin{bmatrix}
-\sin λ_0 & \cos λ_0 & 0 \\
-\sin φ_0 \cos λ_0 & -\sin φ_0 \sin λ_0 & \cos φ_0 \\
\cos φ_0 \cos λ_0 & \cos φ_0 \sin λ_0 & \sin φ_0
\end{bmatrix}'
Unicode2Latex.unicode2latex(latex)
>> M =
\begin{bmatrix}
-\sin \lambda_0 & \cos \lambda_0 & 0 \\
-\sin \varphi_0 \cos \lambda_0 & -\sin \varphi_0 \sin \lambda_0 & \cos \varphi_0 \\
\cos \varphi_0 \cos \lambda_0 & \cos \varphi_0 \sin \lambda_0 & \sin \varphi_0
\end{bmatrix}