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(2+a)^+(2-a)^-2^-a^=
=4+4a+a^+4-4a+a^-4-a^=
=a^+4
(2+a)^2+(2-a)^2-2^2-a^2=4+4a+a^2+4-4a+a^2-4-a^2=4+a^2
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(2+a)^+(2-a)^-2^-a^=
=4+4a+a^+4-4a+a^-4-a^=
=a^+4
(2+a)^2+(2-a)^2-2^2-a^2=4+4a+a^2+4-4a+a^2-4-a^2=4+a^2