cos((pi*x)/4)

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Solution for cos((pi*x)/4) equation: 


x in (-oo:+oo)

cos((pi*x)/4) = 0

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

t_1 = pi*k_1+pi/2

(pi*x)/4-t_1 = 0

(pi/4)*x-t_1 = 0 // + t_1

(pi/4)*x = t_1 // : pi/4

x = t_1/(pi/4)

x = pi*k_1+pi/2/(pi/4) i k_1 należy do I

x = pi*k_1+pi/2/(pi/4)

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