докажите, что выражения тождественно равны
A) (a^2+b^2+c^2) +(a^2-b^2+c^2) -(a^+b^2-c^) и a^-b^2+3c^2
B) (a^3-d^2-c) -(3a^-2d^2+c)+(2a^3-d^2+2c) и 0 помогите!!
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