General rose polar equations are:
[tex]\begin{gathered} r=acos(n\theta) \\ r=asin(n\theta) \end{gathered}[/tex]
a gives us the length of each petal
n gives us the number of petals: if n is odd, then the number of petals = n; if n is even, the number of petals is 2n
So: in your equation, 7 is the length of petals and 4 is the number of petals
