Urgent !!! Sa se rezolve inecuatiile pe intervalul mentionat:
a) (x-2)(2x+1)-( 2x-1)^{2} <2(x-1)(x+1) , x∈[1,+∞)
b)( 2x+1)^{3} -3(1-2x) ^{2} \leq 8( x^{3} -2), x∈[-2,4]

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