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D( x )
49*w^2*x^4 = 0
49*w^2*x^4 = 0
49*w^2*x^4 = 0
49*w^2*x^4 = 0 // : 49*w^2
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(14*w^3*x^4)/(49*w^2*x^4) = 0
2/7*w = 0
x naleu017Cy do R
x in (-oo:0) U (0:+oo)
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