1 float abs(float x)
2 {
3 if(x<0) x=0-x;
4 return x;
5 }
6
7
8 float sin(float x)
9
10 {
11
12 const float B = 1.2732395447;
13 const float C = -0.4052847346;
14 const float P = 0.2310792853;//0.225;
15 float y = B * x + C * x * abs(x);
16 y = P * (y * abs(y) - y) + y;
17 return y;
18 }
19
20
21 float cos(float x)
22 {
23 const float Q = 1.5707963268;
24 const float PI =3.1415926536;
25 x += Q;
26
27 if(x > PI)
28 x -= 2 * PI;
29
30 return( sin(x));
31 }
32
33
34 float sqrt(float a)
35 {
36 double x,y;
37 x=0.0;
38 y=a/2;
39 while(x!=y)
40 {
41 x=y;
42 y=(x+a/x)/2;
43 }
44 return x;
45 }
46
47
48 float pow(float a,int b)
49 {
50 float r=a;
51 if(b>0)
52 {
53 while(--b)
54 r*=a;
55
56 }
57 else if(b<0)
58 {
59 while(++b) r*=a;
60 r=1.0/r;
61 }
62 else r=0;
63 return r;
64 }
