tana=5/12
sina/cosa=5/12
sina=5/12cosa
sin²a+cos²a=25/144cos²a+cos²a=169/144cos²a=1
cosa=12/13
sina=5/12cosa=5/13
sina+cosa=17/13
tana=5/12
sina/cosa=5/12
sina=5/12cosa
sin²a+cos²a=25/144cos²a+cos²a=169/144cos²a=1
cosa=12/13
sina=5/12cosa=5/13
sina+cosa=17/13