find domain and range of function f= {(x, 1/1-x²):x belongs to R?

 In signum and greatest integer function, why does the line starts with a large dot???????

 Where can I find solutions to R.D.Sharma Maths book ,class XI without registering for it?

find the domain and range of

f(x)=x square/1+x square

Write domain and range of greatest integer function

find domain and range:

f(x) = 1/2-sin 3x

find the domain and range of 3/2-x^2

find domain and range

f(X)=1/{sqrt(5)-x}

how can you find the range and domain of root of(9-x²)?