How do you evaluate $arccos 0.0127$ ?

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Answer 1 · 2016-12-21T14:40:17

$89^@27; 270^@73$

Use Calculator and unit circle:
cos x = 0.0127 --> arc $x = +- 89^@27$
Answers for (0, 360):
$89^@27 and 270^@73$ (co-terminal to -89.27)

How do you evaluate arccos 0.0127arccos 0.0127?