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D( t )
t < 0
t < 0
t in <0:+oo)
t^0.9 = -6*10*(0.105/5.5) // + -6*10*(0.105/5.5)
t^0.9-(-6*10*(0.105/5.5)) = 0
t^0.9+1.14545455 = 0
1*t^0.9 = -1.14545455 // : 1
t^0.9 = -1.14545455
( -1.14545455 < 0 i 0.9 in (0:1) ) => t naleu017Cy do O
t belongs to the empty set
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