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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
3 = (50.2/2)*(16/a) // - (50.2/2)*(16/a)
3-((50.2/2)*(16/a)) = 0
3-401.6*a^-1 = 0
-401.6*a^-1 = -3 // : -401.6
a^-1 = 0.00747012
-1 < 0
1/(a^1) = 0.00747012 // * a^1
1 = 0.00747012*a^1 // : 0.00747012
133.8666581 = a^1
a = 133.8666581
a = 133.8666581
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