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I have a function In[186]:= v[k_, x_] = u1[x] - u2[x] Out[186]= 1 - 10 (2 - k)^x + (1 - k)/(2 k) - 2 k - k/(2 (1 - k)) + 10 (1 + k)^x + 1/2 (-(1 - k)^2 - k^2) + 1/2 ((1 - k)^2 + k^2) - Log[2/(Sqrt[15] Sqrt[(1 - k)/k])]...