Demo

Using nerdamer version:

Supported functions
Instructions

To enter an expression just type it in the box below with the format: expression;variable=value e.g. cos(x)+1,x=PI
To define a function type in f(parameters):=function_body, e.g. f(x):=tan(x)/x^2.
To reload a function to the editor click the reload button next to the calculated expression.
To plot the a function click the plot button next to the calculated expression.

Check the evaluate box to evaluate functions. Check the expand button to expand the expression.

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