檢視正割函数的原始碼

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|<center><img src=https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fwww.zsbeike.com%2Fimgs%2FA%2FA07330%2Fa07330.0230.1.png&refer=http%3A%2F%2Fwww.zsbeike.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1657145336&t=e8328645baf1c941c9fd8db7db236155 width="300"></center>
<small>[https://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E6%AD%A3%E5%89%B2%E5%87%BD%E6%95%B0&step_word=&hs=0&pn=13&spn=0&di=7084067677328637953&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=0&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=undefined&cs=3402460243%2C3896020565&os=3145751781%2C1817773952&simid=3402460243%2C3896020565&adpicid=0&lpn=0&ln=672&fr=&fmq=1654553351291_R&fm=&ic=undefined&s=undefined&hd=undefined&latest=undefined&copyright=undefined&se=&sme=&tab=0&width=undefined&height=undefined&face=undefined&ist=&jit=&cg=&bdtype=0&oriquery=&objurl=https%3A%2F%2Fgimg2.baidu.com%2Fimage_search%2Fsrc%3Dhttp%3A%2F%2Fwww.zsbeike.com%2Fimgs%2FA%2FA07330%2Fa07330.0230.1.png%26refer%3Dhttp%3A%2F%2Fwww.zsbeike.com%26app%3D2002%26size%3Df9999%2C10000%26q%3Da80%26n%3D0%26g%3D0n%26fmt%3Dauto%3Fsec%3D1657145336%26t%3De8328645baf1c941c9fd8db7db236155&fromurl=ippr_z2C%24qAzdH3FAzdH3Fooo_z%26e3Bzfkjthj_z%26e3Bv54AzdH3Fv1AzdH3F98d9b809_z%26e3Bip4s&gsm=e&rpstart=0&rpnum=0&islist=&querylist=&nojc=undefined&dyTabStr=MCw0LDIsMyw1LDEsNiw3LDgsOQ%3D%3D 来自 呢图网 的图片]</small>
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中文名；正割函数

外文名；Secant

所属类型；三角函数

直角坐标系中；作出的图形叫正割函数的图像 

sec；在三角函数中表示正割函数符号
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正割指的是直角[[三角形]]，斜边与某个锐角的邻边的比，叫做该锐角的正割，用 f(x)=sec（角）表示。正割是余弦函数的倒数。<ref>[https://wenda.so.com/q/1570922934217315 正割函数的定义],360问答 , 2016年5月12日</ref>