→ trigonometri ←
cos C = 3/5 → triple pyth : 3,4,5
CD/AC = 3/5
3/AC = 3/5
AC = 5
sin C = 4/5
sin CAD = CD/AC = 3/5
tan B + 1
= tan (90° - C) + 1
= sin (90° - C)/cos (90° - C) + 1
= cos C/sin C + 1
= 3/4 + 1
= 7/4
sin CAD / (tan B + 1)
= 3/5 × 4/7
= 12/35
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→ trigonometri ←
cos C = 3/5 → triple pyth : 3,4,5
CD/AC = 3/5
3/AC = 3/5
AC = 5
sin C = 4/5
sin CAD = CD/AC = 3/5
tan B + 1
= tan (90° - C) + 1
= sin (90° - C)/cos (90° - C) + 1
= cos C/sin C + 1
= 3/4 + 1
= 7/4
sin CAD / (tan B + 1)
= 3/5 × 4/7
= 12/35