plot e^(-1*sqrt(x^2+y^2))*sin(2*sqrt(x^2+y^2)-w*t)+e^(-1*sqrt((x-c)^2+(y-d)^2))*sin(2*sqrt((x-c)^2+(y-d)^2)-w*t) where w=1,t=0,c=5,d=5, for x from -5 to 10, y from -5 to 10