Initial data commit

Task/Trigonometric-functions/C/trigonometric-functions.c

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+#include <math.h>
+#include <stdio.h>
+
+int main() {
+  double pi = 4 * atan(1);
+  /*Pi / 4 is 45 degrees. All answers should be the same.*/
+  double radians = pi / 4;
+  double degrees = 45.0;
+  double temp;
+  /*sine*/
+  printf("%f %f\n", sin(radians), sin(degrees * pi / 180));
+  /*cosine*/
+  printf("%f %f\n", cos(radians), cos(degrees * pi / 180));
+  /*tangent*/
+  printf("%f %f\n", tan(radians), tan(degrees * pi / 180));
+  /*arcsine*/
+  temp = asin(sin(radians));
+  printf("%f %f\n", temp, temp * 180 / pi);
+  /*arccosine*/
+  temp = acos(cos(radians));
+  printf("%f %f\n", temp, temp * 180 / pi);
+  /*arctangent*/
+  temp = atan(tan(radians));
+  printf("%f %f\n", temp, temp * 180 / pi);
+
+  return 0;
+}