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cos60° = (x, 1,3,)(-1,3,-2) / √(x²)+1²+3²) √(-1)²+3²+(-2)²
½ = -x+3-6 / √(x²+1+9) √(1+9+4)
½=-x-3 / √(x²+10)√14
√(x²+10)√14 = 2(-x-3)
√(14x²+140)= -2x-6
√(14x²+140)²= (-2x-6)²
14x²+140= 4x²+24x+36
14x²-4x²-24x+140-36=0
10x²-24x+104=0
bagi 2
5x²-12x+52=0
gak bisa difaktorkan gunakan rumus ABC