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D( x )
9*x = 0
9*x = 0
9*x = 0
9*x = 0 // : 9
x = 0
x in (-oo:0) U (0:+oo)
sin(8*x)/(9*x) = 0
sin(8*x)/(9*x) = 0 // * 9*x
sin(8*x) = 0
sin(8*x) = 0 <=> 8*x = pi*k_1 i k_1 naleu017Cy do I
t_1 = pi*k_1
8*x-t_1 = 0
8*x-t_1 = 0 // + t_1
8*x = t_1 // : 8
x = t_1/8
x = pi*k_1/8 i k_1 naleu017Cy do I
x = pi*k_1/8
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