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\begin{equation} TBC\sin 36.86+TBA\sin 36.86=49.05N\\ \end{equation}\begin{equation} 2TBC\sin 36.=49.05N\\ \end{equation}\begin{equation} TBC=\frac{49.05N}{2\sin\left(36.86\right)}\\ \end{equation}\begin{equation} TBC=40.88N\\ \end{equation}