What is the functional form of rose petal with 6 petals? I am asked to graph this function with matlab, but it seems impossible according to my calculus textbook. According to my textbook, a rose curve can have the form [itex]r = a \cos n \theta[/itex] or [itex]r = a \sin n \theta[/itex]. When n is even, then there are 2n petals; when n is odd, then there are n petals. Is there any way of accomplishing this, graphing a rose petal with 6 petals?