no idea how to simplify this one:
sqrt [1- [(x-1)^2/(x+1)^2]]
how about starting with substituting 1 by (x+1)2/(x+1)2
ok. thanks! so then i get [(x+1)^2 - (x-1)^2/ (x+1)^2] . after that i expanded the polynomial expressions in the numerator and combined them. that simplifies to sqrt [(4x)/ (x+1)^2] or 2 * sqrt (x)/ (x+1). easy enough.
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