Solve for a
a=\frac{B}{\sin(\frac{5}{3})}
Solve for B
B=\sin(\frac{5}{3})a
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a\sin(\frac{5}{3})=B
Swap sides so that all variable terms are on the left hand side.
\sin(\frac{5}{3})a=B
The equation is in standard form.
\frac{\sin(\frac{5}{3})a}{\sin(\frac{5}{3})}=\frac{B}{\sin(\frac{5}{3})}
Divide both sides by \sin(\frac{5}{3}).
a=\frac{B}{\sin(\frac{5}{3})}
Dividing by \sin(\frac{5}{3}) undoes the multiplication by \sin(\frac{5}{3}).
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