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diff --git a/Master/texmf-dist/doc/latex/probsoln/samples/implicit.tex b/Master/texmf-dist/doc/latex/probsoln/samples/implicit.tex deleted file mode 100644 index 00453df3045..00000000000 --- a/Master/texmf-dist/doc/latex/probsoln/samples/implicit.tex +++ /dev/null @@ -1,41 +0,0 @@ -% These are all implicit differentiation problems - -\newproblem{imd:circ}{% -Find the gradient of the unit circle ($x^2 + y^2 = 1$).}{% -Differentiating with respect to $x$ gives: -\begin{eqnarray*} -2x + 2y\frac{dy}{dx} & = & 0\\ -\frac{dy}{dx} & = & \frac{-2x}{2y}\\ - & = & \frac{-x}{\sqrt{1-x^2}}. -\end{eqnarray*}} - -\newproblem{imd:ysq:xcuov2mx}{% -Find $\frac{dy}{dx}$, given -\begin{displaymath} -y^2 = \frac{x^3}{2-x} -\end{displaymath}}{% -Differentiating both sides w.r.t.\ $x$: -\begin{eqnarray*} -2y\frac{dy}{dx} & = & \frac{(2-x)3x^2 - x^3(-1)}{(2-x)^2}\\ - & = & \frac{3x^2(2-x) + x^3}{(2-x)^2}\\ - & = & \frac{6x^2 - 3x^3 + x^3}{(2-x)^2}\\ - & = & \frac{6x^2-2x^3}{(2-x)^2}\\ - & = & 2x^2\frac{3-x}{(2-x)^2} -\end{eqnarray*} -Therefore -\begin{displaymath} -y\frac{dy}{dx} = x^2\frac{3-x}{(2-x)^2} -\end{displaymath}} - -\newproblem{imd:exy:IIxay}{% -Differentiate w.r.t.\ $x$: -\begin{displaymath} -e^{xy} = 2x + y -\end{displaymath}}{% -Differentiating both sides w.r.t.\ $x$: -\begin{eqnarray*} -e^{xy}(1y + x\frac{dy}{dx}) & = & 2 + \frac{dy}{dx}\\ -xe^{xy}\frac{dy}{dx} - \frac{dy}{dx} & = & 2 - ye^{xy} \\ -\frac{dy}{dx}(xe^{xy}-1) & = & 2 - ye^{xy}\\ -\frac{dy}{dx} & = & \frac{2-ye^{xy}}{xe^{xy}-1} -\end{eqnarray*}} |