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+\documentclass{article}
+%\setlength{\textwidth}{140mm}
+\begin{document}
+\[ \begin{array}{@{}r@{\;=\;}l@{\qquad}r@{\;=\;}l@{}}
+ \sin2\alpha & 2\sin\alpha\cos\alpha, &
+ \cos2\alpha & \cos^2\alpha - \sin^2\alpha\\
+ \sin3\alpha & 3\sin\alpha-4\sin^3\alpha &
+ \cos3\alpha & 3\cos^3\alpha - 3\cos\alpha\\
+ \sin4\alpha & 8\cos^3\alpha\sin\alpha - 4\cos\alpha\sin\alpha &
+ \cos4\alpha & 8\cos^4\alpha - 8\cos^2\alpha + 1
+ \end{array} \]
+\end{document}