How do you simplify $arc tan 0.3839$ ?

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Answer 1 · 2016-07-11T18:55:26

$21^0$

arctan converts the numeric value back to the angle

By my calculator $arctan0.3839 = 21.001795....$

Assuming this has a processing error implies that

$arctan 0.3839=21^0$
,.....................................................
check: Showing all the numbers on the display of my calculator.

$tan(21^0)~~0.383864035035$

Rounding this to 4 decimal places gives $0.3839$

Thus $21^0$ is a reasonable estimate

How do you simplify arc tan 0.3839arc tan 0.3839?