tolong Bantu dong plis soalnya besok udah di kumpul
Jawab:
sin α = 1/2 = d/m
d=1, m = 2,
s² = m²-d² =4-1= 3
s= √3
cos α = s/m = (√3)/2
cos α= ¹/₂ √3
tentukan
a. sin 2 α
= 2 sin α cos α
= 2 (1/2)(1/2√3)
= 1/2 √3
b. cos 2α = 1 - 2 sin²α
cos 2α = 1- 2(1/4) = 1 - 1/2= 1/2
c. tan 2α = ( sin 2α)/(cos 2α)
= 1/2√3 /(1/2)
= √3