Question 347657
f(x)=1/sqrt(1-x^2)
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2. 
1-x^2>0 If it is zero then there is division by zero which is not allowed. If it is less than zero then the denominator is an imaginary number, also not allowed.
-x^2>-1
x^2<1
{{{-1<x<1}}}
2 is F
.
The rest of your answers are correct.
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Ed