2*cos(x/2)

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Solution for 2*cos(x/2) equation: 


x in (-oo:+oo)

2*cos(x/2) = 0

cos(x/2) = 0

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

t_1 = pi*k_1+pi/2

x/2-t_1 = 0

1/2*x-t_1 = 0 // + t_1

1/2*x = t_1 // : 1/2

x = t_1/1/2

x = 2*t_1

x = 2*pi*k_1+pi/2 i k_1 należy do I

2*cos(x/2) = 0  <=>  2 = 0 or 2*cos(x/2) = 0  <=>  cos(x/2) = 0

x = 2*pi*k_1+pi/2

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