Hello all,

well, I'm not sure how to go about simplifying the following problems

tan(2arctan(x))

and

cos(2arcsin(x))

I know I should let theta = 2arctan(x) => tan(theta) = 2x .... I think. However, from that point forward I'm not sure what to do.

I have several others, however these two are the ones that I believe will enable me to figure out the remainder of the problems.

Any and all help is greatly appreciated. Thank you for your time.

jhb