?? tan.html
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<pre>
原型：extern float tan(float x);
用法：#include <math.h>
功能：計算x（弧度表示）的正切值。
說明：返回x的正切值。
舉例：
// tan.c
#include <syslib.h>
#include <math.h>
main()
{
float x;
clrscr(); // clear screen
textmode(0x00); // 6 lines per LCD screen
x=M_PI/4; // M_PI=PI=3.14159265..., defined in math.h
printf("tan(PI/4)=%f",tan(x));
getchar();
return 0;
}
相關函數：<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="cos.html">cos</a>
</pre>
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