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D( x )
e^4 = 0
e^4 = 0
e^4 = 0
e^4 = 0
x belongs to the empty set
x in (-oo:+oo)
((B^2*h^5*x)/(e^4))*r = (k*t^3)/y // - (k*t^3)/y
((B^2*h^5*x)/(e^4))*r-((k*t^3)/y) = 0
(1/(e^4))*B^2*h^5*r*x-(k*t^3*y^-1) = 0 // + k*t^3*y^-1
(1/(e^4))*B^2*h^5*r*x = k*t^3*y^-1 // : (1/(e^4))*B^2*h^5*r
x = (k*t^3*y^-1)/((1/(e^4))*B^2*h^5*r)
x = (k*t^3*y^-1)/((B^2*h^5*r)/(e^4))
x = (k*t^3*y^-1)/((B^2*h^5*r)/(e^4))
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