math question please help!

[Clovers]

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how are you supposed to find the arctan of something?

for example: arctan (3)

 

[allstardentist]

is the problem asking for a specific number for it?

 

[lifeisgood]

how are you supposed to find the arctan of something?

for example: arctan (3)

Arctan(X) is the same as inverse tangent(X)...or 1/tan(X)

I doubt they will ask you the arctan(3) b/c it's 71.56...too complicated for the DAT...

Giving the exact question will help.

Example:

What is the arctan(1/radical 3) ?

The tan(30) = 1/radical 3

So the arctan(1/radical 3) = 30

Do this by taking the arctan of both sides...

Arctan(tan(X)) = x --> arctan(tan(30)) = arctan(1/radical 3)

Therefore the arctan(1/radical 3) MUST be 30.

Hope this makes sense, I am super tired.

 

[wireless_doc]

Arctan(X) is the same as inverse tangent(X)...or 1/tan(X)

I doubt they will ask you the arctan(3) b/c it's 71.56...too complicated for the DAT...

Giving the exact question will help.

Example:

What is the arctan(1/radical 3) ?

The tan(30) = 1/radical 3

So the arctan(1/radical 3) = 30

Do this by taking the arctan of both sides...

Arctan(tan(X)) = x --> arctan(tan(30)) = arctan(1/radical 3)

Therefore the arctan(1/radical 3) MUST be 30.

Hope this makes sense, I am super tired.

No, it is not. Arctan(x) is not 1/tan(x).
Arctan(x) = y means tan👍 = x.
For the question, you need to find y so that tan👍 = 3. I doubt that they would ask this question because 3 is not a special number. Maybe sqrt of 3 or 1/(sqrt of 3) which will give you 60 and 30 degree respectively.

 

[NilamPatel]

yeah he's right

1/tan = cotan not arctan

and DAT would never ask that, its too complicated