How do you use a calculator to approximate $arctan 2.8$ $arctan 2.8$ ?

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Answer 1 · 2017-01-31T12:51:59

$70.3°$

Arctan means you know the tan value and you want to know to which angle that tan value applies.

On most calculators, arctan is shown with the tan key 70.34617594° as $tan^-1$ , which does NOT mean $1/"tan"$

You will probably need to use the 'shift/alt/2ndF' key to use it.

With a D.A.L. calculator, the key presses would be:

Shift $tan^-1 2.8 =$

The display will be $70.34617594$ and is in degrees.

On older calculators you might need to press:

$2.8$ shift $tan^-1$

The answer will be displayed without pressing =.

How do you use a calculator to approximate arctan 2.8arctan2.8arctan 2.8?