+a+1 a+1?
1?a2
a?1
+a?1
1?a2
=
+(a+1)(a+1+
)
1?a2
(a+1)2?(1?a2)
(a?1)(a?1?
)
1?a2
(a?1)2?(1?a2)
=
+a+1+
1?a2
2a
a?1?
1?a2
2a
=a+1+
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