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D( a )
a = 0
(3*a^-3)/4 = 0
a = 0
a = 0
(3*a^-3)/4 = 0
(3*a^-3)/4 = 0
3/4*a^-3 = 0 // : 3/4
a^-3 = 0
a naleu017Cy do O
a in (-oo:0) U (0:+oo)
((3*a^1)/4-((9*a^-3)/4))/((3*a^-3)/4) = 0
((3*a)/4+(-9/4)*a^-3)/((3*a^-3)/4) = 0
(3/4*a-9/4*a^-3)/(3/4*a^-3) = 0
3/4*a-9/4*a^-3 = 0
3/4*a*(1-3*a^-4) = 0
-3*a^-4 = -1 // : -3
a^-4 = 1/3
-4 < 0
1/(a^4) = 1/3 // * a^4
1 = 1/3*a^4 // : 1/3
3 = a^4
a^4 = 3 // ^ 1/4
abs(a) = 3^(1/4)
a = 3^(1/4) or a = -3^(1/4)
3/4*a*(a-3^(1/4))*(a+3^(1/4)) = 0
(3/4*a*(a-3^(1/4))*(a+3^(1/4)))/(3/4*a^-3) = 0
( 3/4*a )
3/4*a = 0 // : 3/4
a = 0
( a+3^(1/4) )
a+3^(1/4) = 0 // - 3^(1/4)
a = -3^(1/4)
( a-3^(1/4) )
a-3^(1/4) = 0 // + 3^(1/4)
a = 3^(1/4)
a in { 0}
a in { -3^(1/4), 3^(1/4) }
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