Solve for a
a=-\arcsin(b_{4})+2\pi n_{1}+\pi \text{, }n_{1}\in \mathrm{Z}
a=\arcsin(b_{4})+2\pi n_{2}\text{, }n_{2}\in \mathrm{Z}\text{, }|b_{4}|\leq 1
Solve for b_4
b_{4}=\sin(a)
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