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again as usual, i unfortunally have another question about the ti-89 titanum

when i insert (x^2)^2 i get x^4 (due to the power law in expoents) but when i insert (x^2)^y i get the same answer back, (x^2)^y. what i think the answer should be is x^2y but i donno whats wrong.

Please try on your own calculators and reply results

thanks again