When, as in the application to rectangular or circular apertures, the form is symmetrical with respect to the axes both of x and y, S = o, and C reduces to C = ff cos px cos gy dx dy,.
Such determinants are called symmetrical.
Few children have perfectly symmetrical teeth and a perfect bite.
In association with this movement in a definite direction the body has become vermiform and bilaterally symmetrical.
The scolex is biradially constructed, the proglottides flattened, quadrangular and bilaterally symmetrical.
