Calculus HELP with domain and range!?

Question

Find the domain and range of the function.

#1) h(t) = cot(t)

Find the domain of the function....

f(x) = √x^2 - 3x + 2 (by the way, the whole right side of the

equation is under the radical.)

Find the domain and range....

h(x) = -5 cos(x/2)

Answer any possible please, I am stuck on all of them. Thanks!

Answer 1

first problem- domain-zero to pi                    

                    range-negative infinity to infinity

    

second problem- domain is zero to infinity

last problem-domain is negative infinity to infinity

                   range is negative 5 to 5