The syntax of the command is 
where function is the expression you are differentiating
x
is the value of variable x at which you are evaluating the derivative,
and tol is the tolerance (the error) you are willing to tolerate in the
result.
If you do not want to specify a tolerance just omit the last comma and tol.
To enter the command d/dx you use key sequence [SHIFT][Integral]
To enter the symbol x in the expression you press [ALPHA][ ) ]
To enter a comma you use [SHIFT] [ ) ]
To enter a power of 10 in the tolerance use [x10^X] key
Example : Calculate 
The key sequence is as follows
[SHIFT] [Integral] 3 [ALPHA] [ ) ] [X^2] [-] 5 [ALPHA] [ ) ] +2 [SHIFT] [ ) ] 2 [SHIFT] [ ) ] 1 [x10^X] [(-)] 12 ) [=]
DO NOT confuse [SHIFT] [ ) ] which enters the comma and [ALPHA] [ ) ] which enters the variable X
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