Solve for a
\left\{\begin{matrix}a=\frac{\sin(x)}{y}\text{, }&y\neq 0\\a\in \mathrm{R}\text{, }&\exists n_{1}\in \mathrm{Z}\text{ : }x=\pi n_{1}\text{ and }y=0\end{matrix}\right.
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ay=\sin(x)-\frac{\mathrm{d}}{\mathrm{d}x}(y)
Subtract \frac{\mathrm{d}}{\mathrm{d}x}(y) from both sides.
ya=\sin(x)
The equation is in standard form.
\frac{ya}{y}=\frac{\sin(x)}{y}
Divide both sides by y.
a=\frac{\sin(x)}{y}
Dividing by y undoes the multiplication by y.
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