is it better to say ##Ker[cos(x)] = \pi \mathbb{Z} \ {\color{red}-} \ {\Large{\frac{\pi}{2}}}\ \vee \ Ker[cos(x)] = \pi \mathbb{Z} \ {\color{red}+} \ \Large{\frac{\pi}{2}} ##(adsbygoogle = window.adsbygoogle || []).push({});

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# Ker[cos(x)] Analysis

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