# What is the equation of the tangent line of #f(x)=Arctan(x/3) # at #x=0#?

Equation of desired tangent is

graph{(y-arctan(x/3))(3y-x)=0 [-5, 5, -2.5, 2.5]}

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The equation of the tangent line of f(x) = Arctan(x/3) at x = 0 is y = x/3.

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