Nilai dari 1/2 -sin^2(π/12) adalah..
A. 1/2√2
B. 1/4
C. √3
D. 1/2√3
E. 1/4√3
Help dong yg bisa ngerjain trigonometri kelas xi +cara thx besok dikumpulin..
Jawaban Terkonfirmasi
1/2 -sin² (π/12) = 1/2.(sin² (π/12) + cos² (π/12)) – sin² (π/12)
= 1/2.(cos² (π/12) – sin² (π/12))
= 1/2.(cos 2(π/12))
= 1/2.(cos (30°))
= 1/2.((√3)/2)
= 1/4.(√3)………….opsi E