How do you find the exact values of $arccos 1$ $arccos1$ ?

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Answer 1 · 2016-11-15T16:43:00

$arccos 1 = 0$ $arccos1=0$

$arccos x$ $arccosx$ is the angle say $θ$ $theta$ whose cosine is $x$ $x$ i.e. an angle for which $cos θ = x$ $costheta=x$

As $cos 0 = 1$ $cos0=1$ , $arccos 1 = 0$ $arccos1=0$

How do you find the exact values of arccos1arccos1?