9cos(1/6x)

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Solution for 9cos(1/6x) equation: 


x in (-oo:+oo)

9*cos((1/6)*x) = 0

cos((1/6)*x) = 0

cos((1/6)*x) = 0  <=>  (1/6)*x = pi*k_1+pi/2 i k_1 należy do I

t_1 = pi*k_1+pi/2

(1/6)*x-t_1 = 0

1/6*x-t_1 = 0 // + t_1

1/6*x = t_1 // : 1/6

x = t_1/1/6

x = 6*t_1

x = 6*pi*k_1+pi/2 i k_1 należy do I

9*cos((1/6)*x) = 0  <=>  9 = 0 or 9*cos((1/6)*x) = 0  <=>  cos((1/6)*x) = 0

x = 6*pi*k_1+pi/2

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