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2pi constant in formula node

How do you use the 2pi constant inside a formula node? pi(2) and 2*pi do not work. Using labview 6i.
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Find attached VI for a version that is working (y=2*pi;). Maybe something else is wrong inside your formula node.

Anyway, you can wire PI as an input for that formula node and use it as a variable.

Hope this helps
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Sorry, I forgot to attach the VI.
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