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x in (-oo:+oo)
y = (2/3)*cos((pi/6)*t) // - (2/3)*cos((pi/6)*t)
y-((2/3)*cos((pi/6)*t)) = 0
(-2/3)*cos((pi/6)*t)+y = 0
t_1 = cos((pi/6)*t)
(-2/3)*cos((pi/6)*t)+y = 0
y-2/3*t_1 = 0
x belongs to the empty set
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