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In any Delta ABC the value of 1-tan""B/2...

In any `Delta ABC` the value of `1-tan""B/2 tan""C/2` is equal to :-

A

`(2a)/(a+b+c)`

B

`(2b)/(a+b+c)`

C

`(2c)/(a+b+c)`

D

None of these

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The correct Answer is:
A
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ALLEN-Solutions of Triangle & Binomial Theorem-EXERCISE-I
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  11. In triangle ABC, of r(1)= 2r(2)=3r(3) Then a:b is equal :-

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  12. In any Delta ABC , cot(A/2),cot(B/2),cot(C/2) are in A.P., then

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  13. In Delta ABC of a :b:c= 7 : 8: 9 .Then cos A : cos B is equal to :-

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  14. The ratio of the area of a regular polygon of n sides inscribed in a c...

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  16. In a triangle ABC a= 4 , b= 3 , angle A =60 ^@ ,Then c is root of equ...

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  17. In a right - angled isosceles triangle , the ratio of the circumradius...

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  19. Given b=2 , c= sqrt(3), angle A= 30^@ then inradius of Delta ABC is :-

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