| http://www.w3.org/ns/prov#value | - There is a formula/method for solving quartic equations exactly, but trying to implement it, without error, with paper and pencil is not especially to be recommended.he is where Mathematica can come into play: either get the exact critical points symbolically in terms of coordinates of the two ends of the light ray, then for particular pairs of coordinates take N; or else use FindRoot.By avoiding
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