# What is the equation of the tangent line of #f(x)=x^2-lnx^2/(x^2+9x)-1# at #x=-1#?

Therefore the tangent in this case has the equation:

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The equation of the tangent line of f(x)=x^2-lnx^2/(x^2+9x)-1 at x=-1 is y = -2x - 1.

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