If it's anything like a TI-89Ti, then yeah. From the home screen, type this: (I'm assuming your function is in Y1)

zeros(Y1(x),x)

(zeros() is under F2:Algebra)

If you want to use a restriction on the domain (VERY recommended for trig functions) use solve instead:

solve(Y1(x)=0,x)|x>-10 and x<10

solve is in the same place as zeroes, "and" is in 2nd math/8:test/8:and