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D( x )
3.83-((pi/2)*x^4) = 0
3.83-((pi/2)*x^4) = 0
3.83-((pi/2)*x^4) = 0
(pi/2)*x^4 = -3.83 // : pi/2
x^4 = -7.66*pi^-1
x in (-oo:+oo)
10800 = 26260.875/(3.83-((pi/2)*x^4)) // - 26260.875/(3.83-((pi/2)*x^4))
10800-(26260.875/(3.83-((pi/2)*x^4))) = 0
10800-26260.875*(3.83-((pi/2)*x^4))^-1 = 0
10800-26260.875/((pi/2)*x^4+3.83) = 0
(10800*((pi/2)*x^4+3.83))/((pi/2)*x^4+3.83)-26260.875/((pi/2)*x^4+3.83) = 0
10800*((pi/2)*x^4+3.83)-26260.875 = 0
5400*pi*x^4+15103.125 = 0
(5400*pi*x^4+15103.125)/((pi/2)*x^4+3.83) = 0
(5400*pi*x^4+15103.125)/((pi/2)*x^4+3.83) = 0 // * (pi/2)*x^4+3.83
5400*pi*x^4+15103.125 = 0
5400*pi*x^4 = -15103.125 // : 5400*pi
x^4 = -2.796875*pi^-1
x belongs to the empty set
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