TANGENS (A – B) TRIGONOMETRI – MATEMATIKA SMA KELAS 11

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Oleh : Suryadi
Director of Education Apenso Indonesia

SOAL :
Hitunglah tan 15° !

JAWAB :
tan 15° = tan (60° – 45°)
              = (tan 60° – tan 45°) / ( 1 + tan 60° . tan 45°)
              = (√3 – 1) / (1 + √3 . 1)
              = (√3 – 1) / (1 + √3)
              = (√3 – 1) / (1 + √3) x (1 – √3) / (1 – √3)
              = (√3 – 3 – 1 + √3) / (1 – 3)
              = (2√3 – 4) / – 2
              = – √3 + 2 

🌸Selamat Belajar & Good Luck!🌸