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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. #ifndef M_PI
  5. #define M_PI (4*atan(1.0))
  6. #endif
  7.  
  8. double sqr(double x) { return x*x; } // просто возведение в квадрат
  9.  
  10. double sinus(double x);
  11. double cosinus(double x);
  12.  
  13. double sinus(double x) {
  14.     if(fabs(x) < 2.45E-5) { // (2.45E-5)²/6 ≈ 1E-10
  15.         return x;
  16.     } else {
  17.         return 2*sinus(x/2)*cosinus(x/2); // формула синуса двойного угла
  18.     }
  19. }
  20.  
  21. double cosinus(double x) {
  22.     if(fabs(x) < 1.4E-5) { // (1.4E-5)²/2 ≈ 1E-10
  23.         return 1.0;
  24.     } else {
  25.         return sqr(cos(x/2)) - sqr(sin(x/2)); // формула косинуса двойного угла
  26.     }
  27. }
  28.  
  29. int main() {
  30.     printf("sin(π/6) = %f\n", sinus(M_PI/6));
  31.     printf("cos(π/3) = %f\n", cosinus(M_PI/3));
  32.     return 0;
  33. }
Success #stdin #stdout 0s 4420KB
comments (?)
stdin 
Standard input is empty
stdout 
sin(π/6) = 0.500000
cos(π/3) = 0.500000
https://ideone.com/ZdVk3b
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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