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extern double sin (double), cos (double); __inline double atan (double __x) { register double __result; #if defined(__i386__) || defined(__x86_64__) __asm __volatile__ ("" : "=t" (__result) : "0" (__x)); #else __result = __x; #endif return __result; } double f(double x) { double t = atan (x); return cos (t) + sin (t); }