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<h1>数学函数 - cos</h1>
<p>原型extern float cos(float x);</p>
<p>用法:#include &lt;math.h></p>
<p>功能求x弧度表示的余弦值</p>
<p>说明:返回值在[-1.01.0]之间。</p>
举例:<pre>
// cos.c
#include &lt;syslib.h>
#include &lt;math.h>
main()
{
float x;
clrscr(); // clear screen
textmode(0x00); // 6 lines per LCD screen
x=PI/4.;
printf("cos(%.4f)=%.4f\n",x,cos(x));
getchar();
return 0;
}
</pre>相关函数:<a href="asin.html">asin</a>,<a href="acos.html">acos</a>,<a href="atan.html">atan</a>,<a href="atan2.html">atan2</a>,<a href="sin.html">sin</a>,<a href="tan.html">tan</a>