# Trigonometry

posted by
**Carrie**
.

Find the domain of the function.

Write your answer using infinity and union.

f(x)=x/x^2+1

f(x)=2x^2/x-3

posted by
**Carrie**
.

Find the domain of the function.

Write your answer using infinity and union.

f(x)=x/x^2+1

f(x)=2x^2/x-3