To learn about this type problem, go here: http://math.illinois.edu/~rasekh2/math231(s2016)/PolarEquations.pdf The graph of the polar equationor is a rose with n or 2n equally-spaced petals, each of length = a. If n is odd, there will be n-petals. If n is even, there will be 2n petals. If it's sine, one petal is bisected by the y-axis. If it's cosine, one petal is bisected by the x-axis. Edwin