Find the points at which the following polar curve has a horizontal or a vertical tangent line. r=2−2sinθ
Find dx/dy as a function of θ.
dx/dy=

Identify the points where the curve has a horizontal tangent line. Select all that apply.
A. (4, 2π)
B. (3, 67π )
C. (4, 23π )
D. (3, 611π )
E. (1, 65π )
F. (1, 6π)
G. (3, 6π)
H. (0, 2π​)
I. (3, 65π)