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98% of people can't solve this = 3 = Z (R) H()=Hk;has a ring structure KEN (-,B) :C →Setis contravariant (AB)= {φ:A →B|φ is a morphism} given that is the derived functor of and sequence 0 →(H(;))→H()→(Hi(;))→0. is exact describeH*)in terms of polynomal ring over