cos 3x=-½√3
cos3x=150
cos x=50
x=50+k.360 atau x=(360-50)+k.360
subtitusi k=0
X1=50
X2=310
batasan 0<x<180
hd hp{50}
c=180-120-30=30
luas=(6²×sin120×sin30)/2sin30
= 36×½√3×½/1
9√3
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cos 3x=-½√3
cos3x=150
cos x=50
x=50+k.360 atau x=(360-50)+k.360
subtitusi k=0
X1=50
X2=310
batasan 0<x<180
hd hp{50}
c=180-120-30=30
luas=(6²×sin120×sin30)/2sin30
= 36×½√3×½/1
9√3