On Wed, 16 Mar 2005 s.ruiter at ru.nl wrote: > > Why does > > asin(1) > result in: > 1.570796 Because the arcsin of 1 is pi/2 radians. > and > > x<-sqrt(2) > asin(x^2-1) > result in: > NaN Because you can't take the arcsin of 2^2-1=3. -thomas