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[cos t -sin t]
[sin t cos t]
cos t = 1/2
sin t = √3/2
maka, nilai sudut yang memenuhi adalah 60°
60°*3 = 180°
[cos 180° -sin180°] [-1]
[sin 180° cos180° ][3]
= [-1 0] [-1]
[0 -1] [3]
= [1]
[-3]