▁the ▁software ▁Der ive ; ▁the ▁T I - N sp ire ▁series ▁replaced ▁Der ive ▁in ▁ 2 0 0 7 . ▁The ▁T I - 8 9 ▁series , ▁first ▁released ▁in ▁ 1 9 9 8 , ▁also ▁contains ▁a ▁C AS . ▁Cas io ▁released ▁their ▁first ▁C AS ▁calcul ator ▁with ▁the ▁CF X - 9 9 7 0 G ▁and ▁succeeded ▁it ▁with ▁the ▁Al gebra ▁F X ▁Series ▁in ▁ 1 9 9 9 - 2 0 0 3 ▁and ▁the ▁current ▁Class Pad ▁Series . ▁ ▁Symbol ic ▁manip ulations ▁The ▁symbol ic ▁manip ulations ▁supported ▁typically ▁include : ▁simpl ification ▁to ▁a ▁smaller ▁expression ▁or ▁some ▁standard ▁form , ▁including ▁automatic ▁simpl ification ▁with ▁assumptions ▁and ▁simpl ification ▁with ▁constraints ▁substitution ▁of ▁symbols ▁or ▁numeric ▁values ▁for ▁certain ▁expressions ▁change ▁of ▁form ▁of ▁expressions : ▁expand ing ▁products ▁and ▁powers , ▁partial ▁and ▁full ▁factor ization , ▁re writing ▁as ▁partial ▁fra ctions , ▁constraint ▁satisfaction , ▁re writing ▁trig on ometric ▁functions ▁as ▁expon entials , ▁transform ing ▁logic ▁expressions , ▁etc . ▁partial ▁and ▁total ▁different iation ▁some ▁in defin ite ▁and ▁definite ▁integration ▁( see ▁symbol ic ▁integration ), ▁including ▁mult id im ensional ▁integr als ▁symbol ic ▁const rained ▁and ▁un const rained ▁global ▁optimization ▁solution ▁of ▁linear ▁and ▁some ▁non - linear ▁equations ▁over ▁various ▁domains ▁solution ▁of ▁some ▁differential ▁and ▁difference ▁equations ▁taking ▁some ▁limits ▁integral ▁transform s ▁series ▁operations ▁such ▁as ▁expansion , ▁summ ation ▁and ▁products