The picture below shows how you can define the parameters which will be used in generating the mathematical expression. When a parameter is added as "PARAM_X", the application knows that the output will be X and when you add "PARAM_something" the output will be "something". In order to generate an expression like X + Y + cos(X) + sin(Y) you need to define two parameters: PARAM_X and PARAM_Y and four base elements like PARAM_X, PARAM_Y, cos(PARAM_X), sin(PARAM_Y).

In this window you can also define the sufix operation and number to be put after each resulting element. For example you could have something like X / 2 + Y * 3 + cos(X/8) + sin(Y/16) where /2, *3, /8, /16 are the operation and the number which are put after the resulting element.

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