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#define PI (3.141592654f)
/* x2 x4 x6 x8 x10 x12
cos x = 1 - ---- + ---- - ---- + ---- - ------ + ------
2! 4! 6! 8! 10! 12!x2 x4 x6 x8 x10 x12
cos x = 1 - ---- + ---- - ---- + ---- - ------ + ------
2 24 720 40320 3628800 479001600
a = 1/2
b = 1/24
c = 1/720
d = 1/40320
e = 1/3628800
f = 1/479001600cos x = 1 - ax2 + bx4 - cx6 + dx8 - ex10 + fx12
cos x = 1 - x2(a - x2(b - x2(c - x2(d - x2 (e - fx2))))) */
#define COS_A (1.0/2.0)
#define COS_B (1.0/24.0)
#define COS_C (1.0/720.0)
#define COS_D (1.0/40320.0)
#define COS_E (1.0/3628800.0)
#define COS_F (1.0/479001600.0)static fCoor_t sa_cos (fCoor_t arg) {
fCoor_t x = arg * arg;
return 1 - x * (COS_A - x * (COS_B - x * (COS_C - x * (COS_D - x * (COS_E - COS_F * x)))));
}
это конечно не девайн а функция но аналогия ясна