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Hagamolos por partes.
(s+z)(s+z)= s²+sz+z²+sz
(s²+2sz+z²)(s+z)= s³+2sz²+z³+sz²+2s²z+2s²z
Lo simplificamos, sumamos terminos semejantes.
Este es el resultado
s³+3sz²+z³+3sz²