Home
Class 11
MATHS
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

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • Solutions of Triangle & Binomial Theorem

    ALLEN|Exercise EXERCISE-II|11 Videos

  • Solutions of Triangle & Binomial Theorem

    ALLEN|Exercise EXERCISE (O-1)|11 Videos

  • Solutions of Triangle & Binomial Theorem

    ALLEN|Exercise Illustration|27 Videos

  • SOLUTION AND PROPERTIES OF TRIANGLE

    ALLEN|Exercise All Questions|62 Videos

  • TRIGNOMETRIC RATIOS AND IDENTITIES

    ALLEN|Exercise All Questions|1 Videos

Similar Questions

Explore conceptually related problems

If in triangle ABC (r)/(r_(1))=(1)/(2), then the value of tan(A/2)(tan(B/2)+tan(C/2)) is equal to

If in a triangle ABC, b + c = 3a, then tan (B/2)tan(C/2) is equal to

In a Delta ABC sum((cot A+cot B)/(tan A+tan B)) is equal to

In triangle ABC, if r_(1)=3r, then the value of tan((A)/(2))(tan((B)/(2))+tan((C)/(2))) is equal to

In a delta ABC, if tan A:tan B:tan C=3:4:5 then the value of sin A:sin B:sin C is equal to

In a Delta ABC , If tan A/2, tan B/2, tan C/2 are in A.P. then cos A. cos B, cos C are in

In a triangle tan A+tan B+tan C=6 and tan A tan B=2, then the values of tan A,tan B and tan C are

ALLEN-Solutions of Triangle & Binomial Theorem-EXERCISE-I
  1. If the anngle A,B,C of a Delta ABC are in A.P then :-

    Text Solution

    |

  2. In a Delta ABC b= sqrt(3)+1, c=sqrt(3)-1 , angle A = 60 ^@ then the v...

    Text Solution

    |

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

    Text Solution

    |

  4. If c^2=a^2+b^2,2s = a+b+c , then 4 Delta ^2=

    Text Solution

    |

  5. If in a Delta the ex-reddii (r(1) r(2) r(3) are in the ratio 1:2:3 t...

    Text Solution

    |

  6. If in a triangle (r(2)- r(1))(r(3)-r(1))=2r(3)r(3) then the triangle i...

    Text Solution

    |

  7. In a Delta ABC,(a+b+c) (b+c+a)=kbc if

    Text Solution

    |

  8. In Delta ABC if (a+b+c) ( a-b+c)= 3ac, Then find angle B

    Text Solution

    |

  9. The perimeter of atriangle ABC is 6 times the arihmetic mean of the si...

    Text Solution

    |

  10. If in A B C ,A C is double of A B , then the value of (cotA)/2cot(B-C...

    Text Solution

    |

  11. In Delta ABC a =5 ,b=3 ,c=7 .Then value of 3coC +7 cos B is equal :-

    Text Solution

    |

  12. In triangle ABC, of r(1)= 2r(2)=3r(3) Then a:b is equal :-

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  16. In Delta ABC anlge A = (pi)/(6) & b:c= 2: sqrt(3) "then " angle B is

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  19. The exradii of a triangle r(1),r(2),r(3) are in HP , then the sides a,...

    Text Solution

    |

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

    Text Solution

    |