Solve the problem
43) Find equations for the horizontal and vertical tangent lines
to the curve r = 1 - sinθ, 0 ≤ θ < 2π.
Please check if your answer is correct with the following:
Horizontal: y = 1/4 at (1/2, π/6), y = 1/4 at (1/2, 5π/6), y =
-2 at (2, 3π/2)
Vertical: x = 0 at (0, π/2), x = -3sqrt(3)/4 at (3/2, 7π/6), x =
3sqrt(3)/4 at (3/2, 11π/6)