4cos(x/3)

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Solution for 4cos(x/3) equation: 


x in (-oo:+oo)

4*cos(x/3) = 0

cos(x/3) = 0

cos(x/3) = 0  <=>  x/3 = pi*k_1+pi/2 i k_1 należy do I

t_1 = pi*k_1+pi/2

x/3-t_1 = 0

1/3*x-t_1 = 0 // + t_1

1/3*x = t_1 // : 1/3

x = t_1/1/3

x = 3*t_1

x = 3*pi*k_1+pi/2 i k_1 należy do I

4*cos(x/3) = 0  <=>  4 = 0 or 4*cos(x/3) = 0  <=>  cos(x/3) = 0

x = 3*pi*k_1+pi/2

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