6

Trigonometry

  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. main() {
  5.     float x;
  6.  
  7.     /* empirical demonstration that sin(2x) = 2sin(x) * cos(x) */
  8.     for ( x = 0; x < 2.0; x += 0.2 )
  9.         printf("\t%.1f\t\t%f\t%f\n", x, sin(2*x), 2*sin(x) * cos(x));
  10. }
$ gcc -o trigo trigo.c
$ ./trigo 
	0.0		0.000000	0.000000
	0.2		0.389418	0.389418
	0.4		0.717356	0.717356
	0.6		0.932039	0.932039
	0.8		0.999574	0.999574
	1.0		0.909297	0.909297
	1.2		0.675463	0.675463
	1.4		0.334988	0.334988
	1.6		-0.058374	-0.058374
	1.8		-0.442521	-0.442521

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