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D( w )
16*w^2-1 = 0
16*w^2-1 = 0
16*w^2-1 = 0
16*w^2 = 1 // : 16
w^2 = 1/16
w^2 = 1/16 // ^ 1/2
abs(w) = 1/4
w = 1/4 or w = -1/4
w in (-oo:-1/4) U (-1/4:1/4) U (1/4:+oo)
(7*w-2)/(16*w^2-1) = 0
7*w-2 = 0 // + 2
7*w = 2 // : 7
w = 2/7
w = 2/7
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