1/3cos(3x)

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Solution for 1/3cos(3x) equation: 


x in (-oo:+oo)

(1/3)*cos(3*x) = 0

1/3 = 0

1/3 = 0 // * 3

1 = 0

cos(3*x) = 0

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

t_1 = pi*k_1+pi/2

3*x-t_1 = 0

3*x-t_1 = 0 // + t_1

3*x = t_1 // : 3

x = t_1/3

x = pi*k_1+pi/2/3 i k_1 należy do I

(1/3)*cos(3*x) = 0  <=>  1/3 = 0 or (1/3)*cos(3*x) = 0  <=>  cos(3*x) = 0

x = pi*k_1+pi/2/3

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