# Prime Notation

To enter the prime symbol, you can click on the ' button located on standard keyboards or on the Desmos keyboard under FUNCTIONS and Misc.

To use prime notation for derivatives, first try defining a function using f(x) notation. f'(x) can then be used to graph the first order derivative of f(x). Use f''(x) to find the second derivative and so on. Note that depending on the complexity of f(x), higher order derivatives may be slow or non-existent to graph. If the derivative evaluates to a constant, the number is shown in the expression list instead of on the graph. In some cases, you may want to use d/dx notation for derivatives.

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• 白雪

thanks.It's realy what i want to use in my lessons.

• 白雪

kristin,i am david.i am a math teacher in beijing china.Can i ask your help? i want to find if i can use the desmos to get the minimum value of a function?

• Prof Lassonde

Hi David,

I think this is the article your are looking for:

http://support.desmos.com/hc/en-us/articles/202528969-Points-of-Interest-intercepts-intersections-and-more

Hope this helps!

• Brent Ferguson

I'd like to set up an exploration of a Taylor series. But I can't seem to find a way to notate an abstract "nth derivative" in Desmos, so that I can write y = sum of [ (nth deriv of f at a) * (x-a)^n / n! ] and then let n be a slider...

It works well enough for functions with clean and predictable derivatives, like cos(x), sin(x), and e^x... but I'd like to use it also for any arbitrary differentiable function. Any ideas?