How do you evaluate $tan^-1 (4/3)$ on the Scientific Calculator?

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Answer 1 · 2016-07-14T00:49:43

$53^@13$

Calculator -->
$tan x = 4/3$ --> arc $x = 53^@13$
Answers for $(0, 2pi)$
$x = 53^@13$ , and
$x = 50.13 + 180 = 233^@13$

How do you evaluate tan^-1 (4/3)tan^-1 (4/3) on the Scientific Calculator?