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Comments (3)

Manson Fong said

at 12:37 pm on Oct 17, 2011

Hi all, about question 4, the title suggests that it is an inequality, but the question says it is an identity. Could anyone confirm which one is correct? Thanks.

chengfan said

at 12:39 pm on Oct 17, 2011

It should be ``equality''.

Manson Fong said

at 12:41 pm on Oct 17, 2011


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