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## 7.12 Elementary Operations

The following functions allow for the propagation of errors when
combining quantities by multiplication. The functions are declared in
the header file ‘`gsl_sf_elementary.h`’.

__Function:__int**gsl_sf_multiply_e***(double*`x`, double`y`, gsl_sf_result *`result`)This function multiplies

`x`and`y`storing the product and its associated error in`result`.

__Function:__int**gsl_sf_multiply_err_e***(double*`x`, double`dx`, double`y`, double`dy`, gsl_sf_result *`result`)This function multiplies

`x`and`y`with associated absolute errors`dx`and`dy`. The product*xy +/- xy \sqrt((dx/x)^2 +(dy/y)^2)*is stored in`result`.