(PHP 4, PHP 5, PHP 7)
asin — 锟斤拷锟斤拷锟斤拷
$arg
) : float
锟斤拷锟斤拷 arg 锟侥凤拷锟斤拷锟斤拷值锟斤拷锟斤拷位锟角伙拷锟饺★拷asin()
锟斤拷 sin() 锟侥凤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷思锟斤拷锟斤拷
asin() 锟斤拷围锟斤拷锟矫匡拷锟街碉拷锟斤拷锟�
a==sin(asin(a)) 锟斤拷
arg锟斤拷锟斤拷锟斤拷牟锟斤拷锟�
arg 锟侥凤拷锟斤拷锟揭伙拷锟饺★拷