f(x-1)= \frac{{e^{2x-1}} \times {e^{2x}}} {{x^2}\times{x-1}^2}}}
f(x-1)= \frac{{e^{2x-1}} \times {e^{2x}}} {{x^2}\times{x-1}^2}}}
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y^n = \displaystyle\sum_{r=0}^{n} \frac{n!}{r!(n-r)!} f^ng^n^-^r[br]
y^n = f^ng + n(f^n^-^1g^n^-^2+f^n^-^2g^n^-^1)+fg^n
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