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### 53.1 Functions and Variables for impdiff

Function: implicit_derivative (f, indvarlist, orderlist, depvar)

  This subroutine computes implicit derivatives of multivariable functions. f is an array function, the indexes are the derivative degree in the indvarlist order; indvarlist is the independent variable list; orderlist is the order desired; and depvar is the dependent variable.

  To use this function write first `load("impdiff")`.

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