cos²a=1-sin²a
cos²a=1-(7/25)² = 1-49/625=625/625-49/625=576/625
cos a=24/25
tg a= sin a/cos a = 7/25:24/25=7/25*25/24=7/24
ctg a=24/7
cos²a=1-sin²a
cos²a=1-(7/25)² = 1-49/625=625/625-49/625=576/625
cos a=24/25
tg a= sin a/cos a = 7/25:24/25=7/25*25/24=7/24
ctg a=24/7