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the domain will be any combination of x and y values that keep the inside of the ln() greater than zero.
sqrt() needs positive number only...
separate it into 2 functions and define the domains of each function: f(u) = ln(u) and g(x) = sqrt(1+x^2+y^2) are we to assume that y is an implicit funtion of x? or an independant variable?
regardless, sqrt() has to have a domain that is greater than zero for the function to operate inside of normal parameters. Any of this makeing sense?
Since x and y are both squared, anything we use for them will either be a zero or a positive number; which makes sqrt(?) always equal to or greater than 1 which is fine. any values can be used so the domian is (-inf,inf)
since the range is controled by the ln(?) function, it will spit out everything from ln(1)and up....
ln(1) = 0 right?
then the range; the output of this thing; will be from zero to infinity [0,inf)
open or closed just depends on their definitions.... which i am not too certain about :) I mean, open means without bounds, but does a onesided infinity count?
yeah i think it does
double check that and you should have your answers :)
thank you so much!