| Symbolic Integration |
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For example: : is a symbolic result rather than a numerical value for the answer. Finding the derivative of an expression is a straightforward process for which it is easy to determine an Algorithm . The reverse question of finding the integral (of finding an expression whose derivative is the specified expression) is much more difficult. Many expressions that are relatively easy to state do not even ''have'' integrals that can be expressed in Closed Form . A procedure called the Risch Algorithm exists which is capable of determining if an integral exists and returning it if it does, for many classes of expressions. Such algorithms are still being expanded. REFERENCES
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