Solve for D
D=\frac{\cot(x)}{x}
\nexists n_{1}\in \mathrm{Z}\text{ : }x=\pi n_{1}
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x\sin(x)D=\cos(x)
The equation is in standard form.
\frac{x\sin(x)D}{x\sin(x)}=\frac{\cos(x)}{x\sin(x)}
Divide both sides by x\sin(x).
D=\frac{\cos(x)}{x\sin(x)}
Dividing by x\sin(x) undoes the multiplication by x\sin(x).
D=\frac{\cot(x)}{x}
Divide \cos(x) by x\sin(x).
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