Label the triangle differently. Label it so that the tangent of α is v .
Not long ago I had a similar problem, which I was able to solve after reading this thread, but for this question I'm stuck and I could use a small hint.
The Attempt at a Solution
>>I would first solve for arctan(v) in terms of α
>>Label the triangle differently. Label it so that the tangent of α is v .
hmm, I think that is what I have, tan (α) = v = sqrt..., I'm still missing something.