Identify the prism formula from the following.
\( n=(\frac {sin(\frac{A+D_{min}}{2})}{cos(\frac{A}{2}) })\)
\( n=\frac{sin(\frac{A+D_{min}}{4})}{sin(\frac{A}{2}) }\)
\(n=\frac{(sin\frac{A-D_{min}}{2})}{sin(\frac{A}{2})}\)
\( n=\frac{sin\frac{(A+D_min)}2)}{{sin(\frac{A}{2}) }}\)
