Solve for E_m
E_{m}=\frac{e}{\cos(tw)}
t=0\text{ or }\nexists n_{1}\in \mathrm{Z}\text{ : }w=\frac{\pi n_{1}}{t}+\frac{\pi }{2t}
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E_{m}\cos(wt)=e
Swap sides so that all variable terms are on the left hand side.
\cos(tw)E_{m}=e
The equation is in standard form.
\frac{\cos(tw)E_{m}}{\cos(tw)}=\frac{e}{\cos(tw)}
Divide both sides by \cos(wt).
E_{m}=\frac{e}{\cos(tw)}
Dividing by \cos(wt) undoes the multiplication by \cos(wt).
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