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g = 2-1/k |*k
gk = 2k-1
gk-2k = -1
k(g-2) = -1 |:(g-2)
k = -1/(g-2)
b)
h = ka²+k
h = k(a²+1) |:(a²+1)
k = h/(a²+1)
i)
a/2 = 2/k |*2
a = 4/k |*k
ak = 4 |:a
k = 4/a