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D( t )
2^1.2 = 0
2^1.2 = 0
2^1.2 = 0
2^1.2 = 0
t belongs to the empty set
t in (-oo:+oo)
((2^2.2*t)/(2^1.2))*t = 7 // - 7
((2^2.2*t)/(2^1.2))*t-7 = 0
2*t^2 = 7 // : 2
t^2 = 7/2
t^2 = 7/2 // ^ 1/2
abs(t) = (7/2)^(1/2)
t = (7/2)^(1/2) or t = -(7/2)^(1/2)
t in { (7/2)^(1/2), -(7/2)^(1/2) }
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