functions with diff and intergrate

• Subject: functions with diff and intergrate
• From: Hans W. Hofmann
• Date: Mon, 14 Sep 2009 08:52:15 +0000 (UTC)

f(x):=(1-%e^(2*x))/(1+%e^(2*x));
df(x):=diff(f(x),x)$ 
df(1);
(%o11) Non-variable 2nd argument to diff:1
#0: df(x=1) -- an error.  To debug this try debugmode(true);

I'm not able to calculate diff'd and intergrate'd functions
how to do?

Gru? HW

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