trig
posted by Sha .
Which expression is equivalent to tan thetasec theta/sin theta?
I don't get this

Do you mean
(tan thetasec theta)/sin theta
or tan theta (sec theta/sin theta) ?
Since they are asking to select "which", there should have been some multiple choices offered. Without knowing the choices, I cannot tell you which one is correct. There are many ways to rewrite the expression.