View Compilation Error

0_0_34802056_9223.cpp: In function 'int main()':
0_0_34802056_9223.cpp:17:29: error: expected ';' before ')' token
          ans+=m*m*sin(k)/2.0);
                             ^
0_0_34802056_9223.cpp:19:25: error: expected ')' before ';' token
     printf("%.3lf\n",ans;
                         ^