# Inverse trig functions

## Homework Statement

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

## The Attempt at a Solution

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

rock.freak667
Homework Helper
You try putting A=tan-1(3)

in which you would need to determine sinA.

You try putting A=tan-1(3)

in which you would need to determine sinA.

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

rock.freak667
Homework Helper
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.