1)I'm supposed to simplify:

Sin ( ArcCot (Sec (ArcTan (x) ) ) )

It's been a while since I've had to do these and I can't remember how to start.

2) Show that ArcSin ((x-1)/(x+1)) = 2 ArcTan (x^(1/2) - pi/2)

I have no clue on this one...

Any thoughts?

Not looking for answers per say, but ideas on what direction to take...