Linked by Andy Roberts on Mon 6th Jun 2005 18:19 UTC
Features, Office Anyone who has used Microsoft Word for a reasonable amount of time will recognise my very own Andy's Laws on Word:
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Except you forgot the backslashes that open and close the math mode environment! I'll again for you,

\[
\sin (\alpha + \beta) = \sin\alpha\cos\beta + \cos\alpha\sin\beta
\]