cos(65)=210/x

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Solution for cos(65)=210/x equation: 


D( x )

x = 0

x = 0

x = 0

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

cos(65) = 210/x // - 210/x

cos(65)-(210/x) = 0

cos(65)-210*x^-1 = 0

-210*x^-1 = -cos(65) // : -210

x^-1 = cos(65)/210

-1 < 0

1/(x^1) = cos(65)/210 // * x^1

1 = (cos(65)/210)*x^1 // : cos(65)/210

210*(cos(65))^-1 = x^1

x = 210*(cos(65))^-1

x = 210*(cos(65))^-1

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