# The value of tan^-1 5

• June 13th 2006, 01:26 PM
Kiwigirl
The value of tan^-1 5
Can someone help me in equation form with the following question?

Give the value of tan^-1 5
• June 13th 2006, 01:45 PM
ThePerfectHacker
Quote:

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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• June 13th 2006, 05:44 PM
Kiwigirl
Why then did someone else I know personally think the answer was -0.2958 ?
• June 13th 2006, 05:48 PM
ThePerfectHacker
Quote:

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)
• June 13th 2006, 05:57 PM
Kiwigirl
Oh ok, thank you :)