Answer:
The angle of inclination of a multivariable function can be calculated by finding the angle of inclination of the tangent plane at the point (x0, y0, z0) or cos(A) = ∇F(x0,y0,z0) * k / |∇F(x0,y0,z0)|1. Here, F(x,y,z) = 0 is a surface and k is the unit vector in the positive z direction.
To calculate the angle of inclination between two surfaces, you can first normalize each vector and then take their dot product. The angle can then be calculated using the formula θ = cos^-1(vf * vg), where vf and vg are the normalized vectors.