How do you evaluate ${cos}^{- 1} (1)$ $cos^-1(1)$ ?

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Answer 1 · 2016-04-26T12:33:39

$2npi, n=0.+-1,+-2,+-3...$

The principal values of $cos^(-1)(1) in [0,2pi]$ are 0 and $2pi$

So, the general value = . $2npi, n=0.+-1,+-2,+-3..$

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