How do you find the exact value of ${cos}^{- 1} (- 1)$ $cos^-1(-1)$ ?

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Answer 1 · 2018-01-28T06:07:05

$(2 n \pm 1) π$ $(2n+-1)pi$ where $ninZZ$

Assume,
$=>cos^-1(-1)=theta$
$=>costheta=-1$
$=>costheta=cospi$
$=>theta=2npi+-pi$ where, $ninZZ$
$=>theta=(2n+-1)pi$ ; $ninZZ$

How do you find the exact value of cos^-1(-1)cos−1(−1)cos^-1(-1)?