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+--- Thread: Some sort equation ... (/showthread.php?tid=1029)
Some sort equation ... - tommy1729 - 10/15/2015
I was thinking about the sign of the n th Derivative.
More precisely real analytic for x>0 where the expansion point Goes from 0 to + oo.
Sine and cosine are simple.
But for other cases , when the expansion point Goes to + oo it is less trivial.
For instance - too give a quite general case -
What about e.g.
D^a(n) f(b(m)) < 0
D^a2(n) f(b2(m)) > 0.
What are the solutions and how to find them easily ?
Maybe this is easy sorry.
I havent thought about it much.
Regards
Tommy1729