[R] Substituting inside expression

[zbynek.janoska@gmail.com]

Thanks,
Your advice solved the problem for one substitution, but I needed to
substitute twice: first s = (a+b+c)/2
and than c = sqrt(a^2 + b^2 -2*a*b*cos(gamma)) and I hoped I can do it
simultaneously
Luckily, I managed to go round the problem and this operation is not
necessary anymore:)

Thanks anyway
zbynek

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