Find x, when:
I have come this far, but here it stops:
Firstly, is this correct?
Secondly, what should I do with ?
In advance: Thank you for your assistance. :]
Looking good!
now, let (so what you are looking for is and -- since )
thus we can draw a right-triangle, with an acute angle , where the opposite side is of length 1 and the adjacent side is of length 3, since this is how we define the tangent ratio. By Pythagoras' theorem, the hypotenuse is
Now, recall that and
i leave it to you to finish up