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simplify (nR^2/((n-1)(n(2R)+(n-1)d)))/(1.2nR^2/((1.2n-1)(1.2n(2R)+(1.2n-1)d))) where d=-60R^2-6R
simplify (nR^2/((n-1)(n(2R)+(n-1)d)))/(1.2nR^2/((1.2n-1)(1.2n(2R)+(1.2n-1)d))) where d=-60R^2-6R
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