Directivity function (polar pattern) of acoustic dipole in closed form?

Is there a closed form formula by which I can describe the polar pattern (directivity function) of an acoustic dipole source? Like a formula which depends on the angle theta? Thank you!

Answer 1

[VBBV]

%if true
  theta = 0:360
polar(sin(theta).^2*pi/180)% sin^2(theta)

[Davide Mori]

I plotted this, shouldn't it be "horizontally placed"?

[VBBV]

%if true
theta = 0:360
polar(theta,sin(theta).^2*pi/180)% sin^2(theta)
view([90 -90])

View function to change its orientation