N.B. i can't type the symbol for vector, so instead i will just type vect.(adsbygoogle = window.adsbygoogle || []).push({});

So, how can you solve:

|R - (vect.R' - vect.a)/|vect.R - vect.a| |

the term (vect.R' - vect.a)/|vect.R - vect.a| is less than one due to physics.

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# Problem of expansion

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