In \[\Delta ABC,\]\[1-\tan \frac{A}{2}\tan \frac{B}{2}=\] [Roorkee 1973]

In \[\Delta ABC,\]\[1-\tan \frac{A}{2}\tan \frac{B}{2}=\] [Roorkee 197

1.	In \[\Delta ABC,\]\[1-\tan \frac{A}{2}\tan \frac{B}{2}=\] [Roorkee 1973]
A.	\[\frac{2c}{a+b+c}\]
B.	\[\frac{a}{a+b+c}\]
C.	\[\frac{2}{a+b+c}\]
D.	\[\frac{4a}{a+b+c}\]
Answer» B. \[\frac{a}{a+b+c}\]

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In \[\Delta ABC,\]\[1-\tan \frac{A}{2}\tan \frac{B}{2}=\] [Roorkee 1973]

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