How do you find the value of $tan^-1 (4/3)$ ?

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Answer 1 · 2016-02-12T10:40:39

$Tan^-1(4/3)=90^@-Tan^-1(3/4)=90^@-36.86989765^@$
$Tan^-1(4/3)=53.13010235^@$

This came from the special triangle with sides $3, 4, 5$ and angles
$36.86989765^@$ and $53.13010235^@$ and $90^@$

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How do you find the value of tan^-1 (4/3) tan^-1 (4/3) ?