Question: Use the bordered determinants to check y = xix (x, x > 0; 0 < a < 1 and 0 < b < 1).

 Use the bordered determinants to check y = xix (x, x > 0; 0 < a < 1 and 0 < b < 1). for quasiconcavity and  

Use the bordered determinants to check y = xix (x, x > 0; 0 < a < 1 and 0 < b < 1). for quasiconcavity and quasiconvexity.

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