Solve for s
s=\frac{\cos(t)}{12}
Solve for t
t=-\arccos(12s)+2\pi n_{1}\text{, }n_{1}\in \mathrm{Z}
t=\arccos(12s)+2\pi n_{2}\text{, }n_{2}\in \mathrm{Z}\text{, }|s|\leq \frac{1}{12}
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12s=\cos(t)
Swap sides so that all variable terms are on the left hand side.
\frac{12s}{12}=\frac{\cos(t)}{12}
Divide both sides by 12.
s=\frac{\cos(t)}{12}
Dividing by 12 undoes the multiplication by 12.
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