Polar Plots in Maple.

[hhhmortal]

Hi, I'm trying to plot a graph of function p(x,y)=cos(x)cos(y) for x between 0 and 2Pi and for y=0 to 7Pi/4.

I tried:

polarplot(cos(x)cos(y),x=0..2Pi,y=0..7Pi/4);

But I think I'm missing out something.

Thanks.