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Let $n$ be a natural number. For $a_i,\omega_i,\varphi_i \in \mathbb{R}$ how can one find solutions $x \in \mathbb{R}$ for the equation:

$\sum_{i=1}^n a_i \cos( \omega_i \cdot (x-\varphi_i)) = 0$

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    @Américo: that looks positively scary. I'd be trying for NR instead if I were Alex.2011-09-01

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