/usr/share/radiance/quadratic.cal is in radiance-materials 4R1+20120125-1.
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quadratic.cal - solve quadratic equation:
Ax^2 + Bx + C = 0
}
determ = B*B - 4*A*C;
root1 = (-B + sqrt(determ))/2/A;
root2 = (-B - sqrt(determ))/2/A;
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