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%\centerline{\bf Instituto Superior Técnico - Departamento de Física}
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Bom dia a todos! 

F\'{i}sica - F\'{\i}sica

Seja a express\~{a}o:
\par
$\int_0^{2\pi} \sin(x)\,dx = 0$
\par
$$\int_0^{2\pi} \sin(x)\,dx = 0$$
\par
$\ln 2 = \sum_{\alpha = 1}^\infty (-1)^\alpha\,{1 \over \alpha}$
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\par
$$\ln 2 = \sum_{\alpha = 1}^\infty (-1)^\alpha\,{1 \over \alpha}$$
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