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x in (-oo:+oo)
x = 3*cos((pi*t^2)/3)+1 // - 3*cos((pi*t^2)/3)+1
x-(3*cos((pi*t^2)/3))-1 = 0
x-3*cos((pi*t^2)/3)-1 = 0
t_1 = cos((pi*t^2)/3)
x-3*cos((pi*t^2)/3)-1 = 0
x-3*t_1-1 = 0
x-3*t_1-1 = 0 // + -3*t_1-1
x = -(-3*t_1-1)
x = 1-(-3*t_1)
x = 1-(-3*cos((pi*t^2)/3))
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