Question

In a triangle ABC (look at the picture) the line segment s bisects angle C. Show that the length of x is given by s=(2abcos(x))/(a+b)

Answer 1

what is x

Answer 2

My bad, it should say the length of s.

Answer 3

what angle is there inside the cos function,
it cant be x as it is a side?

Answer 4

I really want to argue for the fact that this is only available over the complex plane... but, I suppose you're in Euclidean Geometry so I cant talk my way out of it.