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D( a )
a < 0
a < 0
a in <0:+oo)
6*a^(4/3)-(8*a^(3/2)) = 0
6*a^(4/3)-8*a^(3/2) = 0
6*a^(4/3)-8*a^(3/2) = 0
2*a^(4/3)*(3-4*a^(1/6)) = 0
-4*a^(1/6) = -3 // : -4
a^(1/6) = 3/4
( 3/4 < 0 i 1/6 in (0:1) ) => a należy do O
2*a^(4/3) = 0
2*a^(4/3) = 0 // : 2
a^(4/3) = 0
a = 0
a = 0
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