Question

найдите sin a, tga, dga, если cos a = 0,8

Answer 1

sin^a=1-cos^a
sin^a=1-0.64=0,36
sina=0,6

tga=sina/cosa=0,6/0,8=6/10:8/10=
3/4
ctga=cosa/sina=0,8/0.6=4/3