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// Scilab Code Ex4.2: Page:191 (2011)
clc;clear;
r = 1; // For convenience assume radius of the circle to be unity, unit
alpha = 0.8*r; // Distance of light source from the centre of the spherical shell, unit
cos_phi_by_2 = sqrt((alpha+1)/(4*alpha));
printf("\ncos(phi/2) = %d/4", cos_phi_by_2*4);
// Result
// alpha^2+1-2*alpha*cosine('phi')
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