Hi friends,

I want to ask a question. There are fifty mathematical functions in my programme ( (x^2),(x^3), sinx,cosx.. etc. )Apart from these, there is a button called "+".


When I click "+" button, I will chose some of functions. For example ( sinx, cosx,tanx) The last function will be "sinx+cosx+tanx"

or

I will click "+" button and after that I will click (x^2),(x^3),(x^4). The function will be (x^2)+(x^3)+(x^4)

This is what I want but I can't do this.

How can I do this?

Thanks