Question

Va rog rpd, dau coroana!!! ​

Answer 1

Răspuns:

sin^2 a + cos^2 a=1=>sin^2 a=1-cos^2 a=>sin^2 a=1-16/25

sin^2 a= 9/25=> sin a= 3/5

tg a = sin a/ cos a => tg a= 3/4

ctg a= cos a/ sin a=> ctg a= 4/3