I would like to evaluate certain functions created with lambdify. Those 
functions would come from rotations and would have a lot of trigonometric 
function invocations in them with the same parameters. For example, lets 
suppose that it would contain cos(a) many times. I plan to heavily use 
those generated functions, but I am concerned about the performance loss of 
evaluating cos(a) multiple times in one function invocation, when it would 
suffice to evaluate it only once.

I am not sure how lambdify treats these cases, i.e. if it would call cos(a) 
multiple times or not, or if I have to specify it explicitly. Can somebody 
tell me how it works?

Thanks for your help! :)

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