how to find nth derivative

Question:how to find nth derivative

Posted: Lonely 400 Product: Maple

February 26 2009

Please help me how can i find nth derivative of

1/(1+x^2)

when i do

diff(1/(1+x*x), `$`(x, n))

maple gives

diff(1/(1+x^2), `$`(x, n))

even if i do

value(%)

maple still gives the same answer.

thanks

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