cos(60/x)

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Solution for cos(60/x) equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

cos(60/x) = 0

cos(60/x) = 0  <=>  60/x = pi*k_1+pi/2 i k_1 należy do I

t_1 = pi*k_1+pi/2

60/x-t_1 = 0

60*x^-1 = t_1 // : 60

x^-1 = t_1/60

-1 < 0

1/(x^1) = t_1/60 // * x^1

1 = (t_1/60)*x^1 // : t_1/60

60*t_1^-1 = x^1

x = 60*t_1^-1

x = 60*pi*k_1+pi/2^-1 i k_1 należy do I

x = 60*pi*k_1+pi/2^-1

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