1/4cos(4x)*8x

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Solution for 1/4cos(4x)*8x equation: 


x in (-oo:+oo)

8*(1/4)*x*cos(4*x) = 0

8*(1/4)*x = 0

2*x = 0 // : 2

x = 0

cos(4*x) = 0

cos(4*x) = 0  <=>  4*x = pi*k_1+pi/2 i k_1 należy do I

t_1 = pi*k_1+pi/2

4*x-t_1 = 0

4*x-t_1 = 0 // + t_1

4*x = t_1 // : 4

x = t_1/4

x = pi*k_1+pi/2/4 i k_1 należy do I

8*(1/4)*x*cos(4*x) = 0  <=>  8*(1/4)*x = 0 or 8*(1/4)*x*cos(4*x) = 0  <=>  cos(4*x) = 0

x in { 0, pi*k_1+pi/2/4 }

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