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Question: extraction

Question:extraction

kpassi 208 Maple
example error
January 19 2009
0

I looked at the Maple help menu and got acquainted with the op command to extract the elements of a list. How can I extract particular elements of a list. For example....

 

a:=[2, sqrt(7), "john", sin(57)]

how can I extract elements 2, john and sin(57) ? I tried op( [1,3,4] ,a) but I get an error message.

Thanks in advance!
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