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- Function _ArrayAdd
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- Language Reference
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Function Tan
Tan
注意，这些角度的正切值是“无穷大”的：如 -3PI/2、-PI/2、PI/2、3PI/2、5PI/2 等等，对于这些角度，函数的返回值将是 1.63317787283838e+016。
求某个数的正切值（tan）。
Tan ( 表达式 )
参数
| 表达式 | 角度值。 |
返回值
返回表达式的正切值（三角函数的一种）。注意
1° = pi / 180 度。注意，这些角度的正切值是“无穷大”的：如 -3PI/2、-PI/2、PI/2、3PI/2、5PI/2 等等，对于这些角度，函数的返回值将是 1.63317787283838e+016。
相关
Sin, Cos, ASin, ACos, ATan示例
$pi = 3.14159265358979
$x = tan($pi / 4)
$degToRad = $pi / 180
$y = Tan(90 * $degToRad) ;求 90° 的正切
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