tg a = sin a/cos a
cos^2 a = 1 - sin^2 a
cos^2 a = 1 - (24/25)^2
cos^2 a = 1 - (576 / 625)
cos^2 a = 49/625
cos a = 7/25 или cos a = -7/25
tg a = 24/25 : 7/25 = 24*25/25*7 = 24/7
tg a 24/25 :(-7/25) = -24/7
