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Rhunter961 โ
Aryanna Cummings โ
Wiki User
(Ts^4-Tr^4) = (Ts^3+TsTr+TsTr^2+Tr^3)(Ts-Tr)
Ts^4+Ts^3Tr+T^2Tr^2+Tr^3T3+-Ts^3T3-T2Tr^2