# Thread: The value of tan^-1 5

1. ## The value of tan^-1 5

Can someone help me in equation form with the following question?

Give the value of tan^-1 5

2. Originally Posted by Kiwigirl
Can someone help me in equation form with the following question?

Give the value of tan^-1 5
Have a calculator?
$\approx 78.7^o$
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3. Why then did someone else I know personally think the answer was -0.2958 ?

4. Originally Posted by Kiwigirl
Why then did someone else I know personally think the answer was -0.2958 ?
Because they tought,
$\tan^{-1}=\frac{1}{\tan x}$
And they calculated it via radian mode.
Thus, that would do it.

(But I am right because this problem concers inverse tangent function)

5. Oh ok, thank you