1. lim (при x->5) (sinx-sin5)/(x-5) = lim sinx/(x-5) - lim (sin5/(x-5) = lim (x*sinx)/(x*(x-5)) - lim (5*sin5)/(5*(x-5)) = x/(x-5) - 5/(x-5) = 1
2. lim (при х->1) (x^(1/2) -1)/(x^(1/3) -1) = lim ((x^(1/3) -1)*(x^(2/3) + x^(1/3) +1))/(x^(1/3)-1) = lim (x^(2/3) + x^(1/3) +1) = 3