Численные методы. Двойной интеграл по формуле Симпсона

/*****************************************************************************
* .FILE : func.c
* .TITLE : ‘®¤Ya¦?a aea?ae?? ?®«i§®c aY«i, ?®a®aeY ¬®¦®
* : ?§¬Yiai !Y§ ?YaY?®¬??«iae?? ®a®c®© ?a®Fa ¬¬e
* .DESCR : ˜®a«Y ?§¬YY?i ia®F® ¬®¤a«i YF® Y®!a®¤?¬® ?YaY?®¬??«?a®c ai
* : ? a«??®c ai a numeric.obj
* :
* :
* .NOTE : NOT FOR RENTAL OR SALE.
* : FEDERAL LAW PROVIDES SEVERE CIVIL & CRIMINAL PENALTIES FOR
* : UNAUTHORIZED DUPLICATION OR DISTRIBUTION.
* :
* : (C) ’94 by P$P
*****************************************************************************/
#include

/* ce!?a Y¬ i ?®«i§®c aY«Y¬ aea?ae?i No.1 */
double f1 (double x, double y)
{ return 0.5 * cos (y); }

/* ce!?a Y¬ i ?®«i§®c aY«Y¬ aea?ae?i No.2 */
double f2 (double x, double y)
{ return 0.5 – sin (y); }

/* ce!?a Y¬ i ?®«i§®c aY«Y¬ aea?ae?i No.3 */
double f3 (double x, double y)
{ return sqrt (x * x + y * y); }

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