Solve for f
\left\{\begin{matrix}f=\frac{\cos(\theta )}{x}\text{, }&x\neq 0\\f\in \mathrm{R}\text{, }&\exists n_{1}\in \mathrm{Z}\text{ : }\theta =\pi n_{1}+\frac{\pi }{2}\text{ and }x=0\end{matrix}\right.
Solve for x
\left\{\begin{matrix}x=\frac{\cos(\theta )}{f}\text{, }&f\neq 0\\x\in \mathrm{R}\text{, }&\exists n_{1}\in \mathrm{Z}\text{ : }\theta =\pi n_{1}+\frac{\pi }{2}\text{ and }f=0\end{matrix}\right.
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xf=\cos(\theta )
The equation is in standard form.
\frac{xf}{x}=\frac{\cos(\theta )}{x}
Divide both sides by x.
f=\frac{\cos(\theta )}{x}
Dividing by x undoes the multiplication by x.
fx=\cos(\theta )
The equation is in standard form.
\frac{fx}{f}=\frac{\cos(\theta )}{f}
Divide both sides by f.
x=\frac{\cos(\theta )}{f}
Dividing by f undoes the multiplication by f.
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