Law sines in Spherical Triangle $\rightarrow$ Law sines in plane triangle

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Could any one tell me how to estimate or get law of sines in Spherical Triangle to The Law of Sines in Plane Triangle? i.e $\frac{\sin a}{\sin A}=\frac{sin b}{\sin B}=\frac{\sin c}{\sin C}$ to $\frac{ a}{\sin A}=\frac{ b}{\sin B}=\frac{c}{\sin C}$