How do you use a calculator to approximate ${tan}^{- 1} (- \frac{95}{7})$ $tan^-1(-95/7)$ ?

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How do you use a calculator to approximate ${tan}^{- 1} (- \frac{95}{7})$ $tan^-1(-95/7)$ ?

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Answer 1 · 2018-06-24T05:15:21

$- 85^{\circ} 78$ $-85^@78$
$94^{\circ} 21$ $94^@21$

Explanation:

$tan x = - \frac{95}{7} = - 13.57$ $tan x = - 95/7= - 13.57$
Calculator: Press "2nd", then, press "tan" to get:
arc $x = - 85^{\circ} 78$ $x = - 85^@78$
The unit circle gives another arc x that has the same tan value:
arc $x = - 85.78 + 180 = 94^{\circ} 21$ $x = - 85.78 + 180 = 94^@21$

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How do you use a calculator to approximate ${tan}^{- 1} (- \frac{95}{7})$ $tan^-1(-95/7)$ ?

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How do you use a calculator to approximate ${tan}^{- 1} (- \frac{95}{7})$ $tan^-1(-95/7)$ ?