sin(-4x)/7x

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Solution for sin(-4x)/7x equation: 


x in (-oo:+oo)

x*(sin(-4*x)/7) = 0

x = 0

sin(-4*x)/7 = 0

sin(-4*x)/7 = 0 // * 7

sin(-4*x) = 0

sin(-4*x) = 0  <=>  -4*x = pi*k_1 i k_1 należy do I

t_1 = pi*k_1

-t_1-4*x = 0

-t_1-4*x = 0 // + t_1

-4*x = t_1 // : -4

x = t_1/(-4)

x = pi*k_1/(-4) i k_1 należy do I

x*(sin(-4*x)/7) = 0  <=>  x = 0 or x*(sin(-4*x)/7) = 0  <=>  sin(-4*x)/7 = 0

x in { 0, pi*k_1/(-4) }

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