Product of tan or cot of two half-angles in terms of the sides (tan(A/2) tan(C/2) = (s - b)/s)

1. A.
   3
2. B.
   $\frac{1}{13}$
3. C.
   -3
4. D.
   $\frac{1}{3}$

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1. A.
   1
2. B.
   2
3. C.
   $\frac{1}{2}$
4. D.
   4

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1. A.
   $A,C,B$ are in A.P.
2. B.
   $B,A,C$ are in A.P.
3. C.
   $A,B,C$ are in A.P.
4. D.
   $A,B,C$ are in G.P.

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1. A.
   1
2. B.
   $\sqrt{2}$
3. C.
   2
4. D.
   3

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1. A.
   $2$
2. B.
   $a + b - c$
3. C.
   $a + b$
4. D.
   $s - c$

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1. A.
   $s$
2. B.
   $2s$
3. C.
   $(s - a)$
4. D.
   $(s - a)(s - b)$

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