# Inverse trig functions

1. Oct 11, 2010

### fghtffyrdmns

1. The problem statement, all variables and given/known data

Determine $$sin(arctan(3))$$

3. The attempt at a solution

I do not know how to start this. No special triangles : (.

2. Oct 11, 2010

### rock.freak667

You try putting A=tan-1(3)

in which you would need to determine sinA.

3. Oct 11, 2010

### fghtffyrdmns

ahhh so could I write $$sinA = \theta$$?

4. Oct 11, 2010

### rock.freak667

Well I was thinking more along the lines of if A=arctan(3), then you can get tanA

and your problem was to find sin(arctan(3)) which becomes sin(A), which you can find by drawing suitable right angled triangles.