Mathematics, 06.05.2020 04:08, shelley3135

If 90 degrees < theta < 180 degrees, and cos theta = 5/7, what is the cos (-theta)?

I don’t have the mathematical inserts so degrees and theta would of course be used with their actual sign. Thank you in advanced

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If 90 degrees < theta < 180 degrees, and cos theta = 5/7, what is the cos (-theta)?