Your best bet is to write a function that takes different parameters that comprise the equation and have the actual function evaulate the formula for you; there is no way to pull this from a database and have it be evaulated in code that i know of.
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Read this if you want to know how to get a correct reply for your question:
http://www.catb.org/~esr/faqs/smart-questions.html
^^Took that from planoie's profile^^
^^Modified text taken from gbianchi profile^^
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