θ = π/3 , π, 5π/3 when θ = π/3, r = 3/2 when θ = π, r = 0 when θ = 5π/3 , r = 3/2 (3/2, π/3) and (3/2, 5π/3) give horizontal tangent lines </span>--------------------------------------------------------------------------------- For horizontal tangent line, dx/dθ = 0
5:15 because you aren't drawing all of the 52 cards so your proportion would be the probability of drawing at least 5 spade and the 15 cards drawn in all