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Find the Jacobian $\partial(x, y) / \partial(u, v)$ of the transformation\begin{equation}\begin{array}{l}{\text { a. } x=u \cos v, \quad y=u \sin v} \\ {\text { b. } x=u \sin v, \quad y=u \cos v.}\end{array}\end{equation}

In Exercises $1-14,$ find the general solution of the differential equation.$$\frac{d y}{d x}=\frac{x}{y}$$

In Exercises $1-14,$ find the general solution of the differential equation.$$\frac{d y}{d x}=\frac{3 x^{2}}{y^{2}}$$

In Exercises $1-14,$ find the general solution of the differential equation.$$\frac{d y}{d x}=\frac{x^{2}-3}{6 y^{2}}$$

Identify each as an expression or an equation. $$7 t-2=11$$

Identify each as an expression or an equation. $$\frac{3}{4} k+5(k-6)=2$$