regionplot[((a/2-1)^(1/a)<x<=(a-1)^(1/a))&(a>=2),{a,1,6},{x,0,2}]regionplot[((a/2-1)^(1/a)<x<=(a-1)^(1/a))&(a>=2),{a,1,6},{x,0,2}]

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