Ok Sec theta is 4/3 which is r/x. So then y = 1 (I think). But I don't know how to get the exact value from the question. My answer wound up being Cos theta = 3. I'm not seeing something
2026-05-15 18:09:13.1778868553
Determine the exact value of the expression cos(Arcsec(4/3))
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$$\cos\sec^{-1}(4/3) = \cos\cos^{-1}(3/4) = 3/4$$