# Math Help - Exam Question

1. ## Exam Question

In the diagram give, AC = BC = 1, CD = n and angles ABC = $\theta$, BAD = $\beta$.

i) Prove that: tan $\theta$= $\frac{1 - n}{1 + n}$tan $\beta$

ii) What type of triangle is ABD in the case where n= 1?

Could someone please show me how to do this question? I dont get it at all.

2. I've finally solved (i) YAY

But I don't seem to get (ii). Any hints please?