8cos(x/10)

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Solution for 8cos(x/10) equation: 


x in (-oo:+oo)

8*cos(x/10) = 0

cos(x/10) = 0

cos(x/10) = 0  <=>  x/10 = pi*k_1+pi/2 i k_1 należy do I

t_1 = pi*k_1+pi/2

x/10-t_1 = 0

1/10*x-t_1 = 0 // + t_1

1/10*x = t_1 // : 1/10

x = t_1/1/10

x = 10*t_1

x = 10*pi*k_1+pi/2 i k_1 należy do I

8*cos(x/10) = 0  <=>  8 = 0 or 8*cos(x/10) = 0  <=>  cos(x/10) = 0

x = 10*pi*k_1+pi/2

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