all i need to know is whether or not the following is true:(adsbygoogle = window.adsbygoogle || []).push({});

-Cos(x) = Cos(-x)

i know that Cos(-x) = Cos(x), but i was just wondering if it was the same as -Cos(x). if anyone could help it would be greatly appreciated at this late hour ;)

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# Trig function question

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