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sin 30/sin 60 = x/y
y=9-3 akar3=3(3-akar3)
Y = 60
Z = 90
XYZ siku siku di Z
tan 60 = y/x -->x = y/√3 sub ke x + y = 6
y/√3 + y = 6 ...kalikan √3
y + y√3 = 6√3
y(1 +√3) = 6√3
y = 6√3 ( 1- √3) / ( 1 - 3)
y = -3√3 (1- √3)
y = - 3√3 + 9
y = 9 - 3√3