- #include <cmath> 
- #include <iostream> 
-   
- double degrees_to_radians(double deg) 
- { 
-     return deg * M_PI / 180.0; 
- } 
-   
- int main() 
- { 
-     std::cout << "sin(45.0) = " << std::sin(degrees_to_radians(45)) << std::endl; 
-     std::cout << "cos(45.0) = " << std::cos(degrees_to_radians(45)) << std::endl; 
- } 
-   
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