Mathematics, 05.05.2020 20:11 diamondgdm
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)? I don't ha...
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