tanα=5/12
α=arc tan (5/12)
=22.61986494804042617294901087668......°
=22°37.191896882425570376940652600783......'
=22°37'11.513812945534222616439156046996......"
≈22°37'11.5"
tanβ=8/12
β=arc tan (8/12)
=33.69006752597978691352549456166......°
=33°41.404051558787214811529673699608......'
=33°41'24.243093527232888691780421976502......"
≈33°41'24.2"
alpha = arctan (5/12) + k*pi, where k is an integer;
beta = arctan (3/4) + h*pi, where h is an integer.