Transformation formula of hypergeometric function

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I think it's easier to ask your help about my secial case. So, can you please help me to find a relationship wetween $ _2F_1 (1,1,2-2/a; \frac{1}{1+\frac{R^a}{u.s.P}}) \;$ and $\; _2F_1 (1,1,2-2/a; \frac{1}{1+R^{a/2}}) $.

Many thanks in advance.