sint = sqrt(1 - cos^2(t)) = sqrt(1 - (20/29)^2) = sqrt(441/841) = 21/29
tgt = sin(t)/cos(t) = (21/29)/(20/29) = 21/20
ctgt = cos(t)/sin(t) = 20/21
sint = sqrt(1 - cos^2(t)) = sqrt(1 - (20/29)^2) = sqrt(441/841) = 21/29
tgt = sin(t)/cos(t) = (21/29)/(20/29) = 21/20
ctgt = cos(t)/sin(t) = 20/21