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atan - Returns tangent of value in C

  1. Forget Code
  2. C
  3. atan - Returns tangent of value 

  #include <math.h>
  #include <stdio.h>

  int main(void)
  {
   double val = -0.5;
   printf("Arc tangent of %f is %f.\n", val, atan(val));
   return 0;
  }

Output:
Arc tangent of -0.500000 is -0.463648.