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Mathematics 15 Online
OpenStudy (anonymous):

dy/dx ln(xy)=x^2-x

OpenStudy (anonymous):

but what about the other side of the equal sign?

geerky42 (geerky42):

Wait, what do you have to do exactly in this problem?

OpenStudy (anonymous):

it says consider the relation ln(xy)=xy^2-x find dy/dx

geerky42 (geerky42):

Are you sure it's dy/dx ln(xy)=x²-x, not d/dx ln(xy)=x²-x? you can just divide both sides by ln(xy) then replace it to xy²-x

OpenStudy (anonymous):

im sure. it says: consider the relation ln(xy)=xy^2-x find dy/dx

geerky42 (geerky42):

\[\dfrac{dy}{dx} = \dfrac{x^2-x}{\ln(xy)} = \dfrac{x^2 - x}{xy^2 - x}\]Factor x out in both numerator and denominator:\[\dfrac{x(x-1)}{x(y^2-1)} = \boxed{\dfrac{x-1}{y^2-1}}\]

geerky42 (geerky42):

is this clear?

OpenStudy (anonymous):

im just trying to figure out where the numbers came from is all

OpenStudy (anonymous):

Oh and after that it says find the equation of the line tangent to the graph of the relation at the point (1,1) how do I do that?

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