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 Apr4 comment Equations of the tangent lines of $y=x^4$ at the point $(2,0)$? @DanielEscudero Yes! There are lines in both directions. That should explain the lines. Apr4 comment Equations of the tangent lines of $y=x^4$ at the point $(2,0)$? @DanielEscudero Yes. I also think it's weird to ask about lines, In my mind, I also think it's only one line. But he used the plural retas in here. Apr4 comment Equations of the tangent lines of $y=x^4$ at the point $(2,0)$? @DanielEscudero Oh, I get it. What is being asked is the equation of the line that passes through $(2,0)$ and touches the curve. I guess it's this. Apr4 asked Equations of the tangent lines of $y=x^4$ at the point $(2,0)$? Apr3 comment What is the meaning of division for quasigroups in here? @vadim123 Oh yes. Sorry. I was too lazy that I didn't even think about googling quasigroups. I blame the lack of coffee. Apr3 asked What is the meaning of division for quasigroups in here? Apr3 asked Determine the equation of the tangent line to $P=(x_0,x_0^4)$ in $y=x^4$. Apr2 accepted How to show that $\frac{-1}{x^2}=0$ has no solutions? Apr2 comment How to show that $\frac{-1}{x^2}=0$ has no solutions? Good. But multiplying both sides by $x^2$ is the only possible operation to solve that, isn't it? Apr2 asked How to show that $\frac{-1}{x^2}=0$ has no solutions? Apr2 accepted Are there two meanings to induction? Apr2 comment Are there two meanings to induction? Very good. Your answer is the first thing that made the proof tick in my mind. You've made all steps really clear, I am satisfied. Thanks a lot! Apr2 asked A question on the proof of commutativity of the sum of natural numbers? Apr1 comment Are there two meanings to induction? I don't know, but I feel that part a little artificial. But perhaps it's only my own stupidity. Apr1 comment Are there two meanings to induction? Exactly! But the hypothesis is made out of nowhere. It is not a consequence of what was written before. Or if it is, then I really do not see how that could be. Apr1 revised Are there two meanings to induction? added 3 characters in body Apr1 asked Are there two meanings to induction? Mar26 comment Identify the subset of the plane composed by $R\cos \theta=5$ by means of polar coordinates $R,\theta$? @N.F.Taussig I figured it now! Thanks. Mar26 answered Identify the subset of the plane composed by $R\cos \theta=5$ by means of polar coordinates $R,\theta$? Mar25 comment Identify the subset of the plane composed by $R\cos \theta=5$ by means of polar coordinates $R,\theta$? I don't know, I'm a bit confused with the book instructions. It says that the polar coordinates are $(R, \theta)$ and the cartesian coordinates of this point are $(R \cos \theta, R \sin \theta)$. I'm a bit confused.