Solve for s
\left\{\begin{matrix}s=\frac{P}{\cos(\phi )}\text{, }&\nexists n_{1}\in \mathrm{Z}\text{ : }\phi =\pi n_{1}+\frac{\pi }{2}\\s\in \mathrm{R}\text{, }&P=0\text{ and }\exists n_{1}\in \mathrm{Z}\text{ : }\phi =\pi n_{1}+\frac{\pi }{2}\end{matrix}\right.
Solve for P
P=s\cos(\phi )
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s\cos(\phi )=P
Swap sides so that all variable terms are on the left hand side.
\cos(\phi )s=P
The equation is in standard form.
\frac{\cos(\phi )s}{\cos(\phi )}=\frac{P}{\cos(\phi )}
Divide both sides by \cos(\phi ).
s=\frac{P}{\cos(\phi )}
Dividing by \cos(\phi ) undoes the multiplication by \cos(\phi ).
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