若角α的终边过点P(6,8),那么下面四个比值中哪一个是正弦()
①
img class=kfformula src=zzximg/20190808/1565257447178021.png data-latex=\frac {3} {5}/
②
img class=kfformula src=zzximg/20190808/1565257447245759.png data-latex=\frac {4} {5}/
③
img class=kfformula src=zzximg/20190808/1565257447447077.png data-latex=\frac {4} {3}/
④
img class=kfformula src=zzximg/20190808/1565257447800029.png data-latex=\frac {3} {4}/