Trigonometric Functions for Complex Arguments - GNU Scientific Library -- Reference Manual
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#### 7.31.2 Trigonometric Functions for Complex Arguments

— Function: int gsl_sf_complex_sin_e (double zr, double zi, gsl_sf_result * szr, gsl_sf_result * szi)

> This function computes the complex sine, \sin(z_r + i z_i) storing the real and imaginary parts in szr, szi.

— Function: int gsl_sf_complex_cos_e (double zr, double zi, gsl_sf_result * czr, gsl_sf_result * czi)

> This function computes the complex cosine, \cos(z_r + i z_i) storing the real and imaginary parts in czr, czi.

— Function: int gsl_sf_complex_logsin_e (double zr, double zi, gsl_sf_result * lszr, gsl_sf_result * lszi)

> This function computes the logarithm of the complex sine, \log(\sin(z_r + i z_i)) storing the real and imaginary parts in lszr, lszi.

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