let angle thetha be measured from x1 axis counterclockwise to a
line drawn normal to the boundary surface area in a two-dimensional
domain(x1x2 plane). what are the direction cosine ni(n1,n2), the
components of a vector normal to the surface according to
Eq(1.3.9), reduced to two dimensions?
let angle thetha be measured from x1 axis counterclockwise to a line drawn normal to the boundary surface area in a two-
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let angle thetha be measured from x1 axis counterclockwise to a line drawn normal to the boundary surface area in a two-
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