Plot derivative of a function

[HP67]

(06-06-2014 08:24 AM)cyrille de brébisson Wrote:  - -6 is a number (a negative number) the square of a number is the number times the number. and yet -6² is -36!

When the heck did this happen?

(06-06-2014 08:24 AM)cyrille de brébisson Wrote:  - depending on your locale, in right to left writing countries, PI is written 3.14159 or 95141.3 your job to figure out which number is actually ment (PI is easy, but if you read 1.5, you do not know if it is 1.5 or 5.1!)

No, this is not correct. In languages that write from right to left numbers are still written in the normal way (left to right). It's one of many good reasons that all computing should be done in English.