Write:

Tan(Tan^(-1) v + Sin ^(-1) v)

in terms of V, with no trig functions or inverse trig functions. How do I do this?

Also, if I have cos(2sin^(-1) X), I would set (2sin^(-1) X) as A, and say that 2 Sin A=X (and thus, SinA=X/2), correct?

Thanks!