Calculus

3D surface of (cos x)(cos y).

This illustration is a 3D surface plot of the function z = cos x cos y with rainbow gradient showing oscillating peaks and troughs, wireframe grid overlay, and x, y, and z axes.

The function z = cos⁡ x cos⁡ y is a product of two cosine functions, one in the x-direction and the other in the y-direction. This function exhibits periodic behavior in both variables, creating a repeating pattern of peaks and troughs along the surface.

This visualization is ideal for mathematical modeling, multivariable calculus demonstrations, and trigonometric function analysis in mathematics textbooks or research publications.

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