C语言中怎么计算三角函数？全部的程序代码？

math.h里的三角函数用的单位是弧度，你貌似错在这里。   答案补充 Example

/* SINCOS.C: This program displays the sine, hyperbolic

* sine, cosine, and hyperbolic cosine of pi / 2.

*/

#include

#include

void main( void )

{

double pi = 3.1415926535;

double x, y;

x = pi / 2;

y = sin( x );

printf( "sin( %f ) = %f\n", x, y );

y = sinh( x );

printf( "sinh( %f ) = %f\n",x, y );

y = cos( x );

printf( "cos( %f ) = %f\n", x, y );

y = cosh( x );

printf( "cosh( %f ) = %f\n",x, y );

}  答案补充 Output

sin( 1.570796 ) = 1.000000

sinh( 1.570796 ) = 2.301299

cos( 1.570796 ) = 0.000000

cosh( 1.570796 ) = 2.509178

Parameter

x

Angle in radians