Graphing y = cos¯¹(cos x)

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We study this class XI, but it seems to me that the teacher is a university professor

srajandikshit
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You're the inverse of cos c. You're sec c.

tonnyrocks
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Uh, can you tell me how to find
cos^-1*cos(x)
I know it might be too easy but im having a difficult time.
Thank you!

sanchit