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  4. If A + B + C = 180° arrow then ∑ Tan (A/2)Tan (B/2)

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Q. If $A + B + C = 180^{\circ} \rightarrow$ then $\sum Tan\, \frac{A}{2}Tan\, \frac {B}{2}$

KCETKCET 2004

Solution:

Correct answer is (b) 1