How do you use a calculator to approximate ${cos}^{- 1} (0.26)$ $cos^-1(0.26)$ ?

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Answer 1 · 2018-03-27T04:47:40

$\pm 74^{\circ} 93$ $+- 74^@93$

cos x = 0.26
Calculator and unit circle give 2 solutions:
$x = \pm 74^{\circ} 93$ $x = +- 74^@93$

How do you use a calculator to approximate cos−1(0.26)cos^-1(0.26)?