What is the domain of f(x) = cos(x)?
the set of real numbers -2π< x< 2π
the set of real numbers -1< x< 1
the set of real numbers 0 < x< 2π
the set of all real numbers

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Which part of a 2-column proof is the hypothesis of the conjecture? a) given b) reasons c) prove d) statements ! i think it's b but i'm not quite

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.