For which value of theta is tan theta equal to sin theta?

a. pi/2
b. 2pi
c. pi/3
d. 3pi/2

at two pi they are both zero

but
at pi/2 sin is 1 and tan is oo
at pi/3 sin is sqrt3/2 and tan is sqrt3
at 3 pi/2 same problem as at pi/2