Final answer:
The equation for the volume of a cone inscribed in a cube, with both diameter and height equal to the cube's side length s, is V = (1/12)\(\pi s^{3}).
Step-by-step explanation:
To find the equation for the volume of a cone with its diameter and height equal to the side s of the cube, we will use the formula for the volume of a cone, which is V = (1/3)\(\pi r^{2}h). Given that the diameter of the cone is equal to its height and also to the side of the cube, the radius r is half the side length, or s/2. Consequently, substituting s/2 for r and s for h, we get the equation V = (1/3)\(\pi (s/2)^{2}s), which simplifies to V = (1/12)\(\pi s^{3}).