Home
Class 11
MATHS
In DeltaABC , " find " b cos ^(2).(C)/(2...

In `DeltaABC , " find " b cos ^(2).(C)/(2)+c cos^(2).(B)/(2)`

A

` s `

B

` 2s`

C

` 3s `

D

` 4s `

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • PROPERTIES OF TRIANGLES

    AAKASH SERIES|Exercise LECTURE SHEET EXERCISE - I ( Straight Objective Type Questions ) |58 Videos

  • PROPERTIES OF TRIANGLES

    AAKASH SERIES|Exercise LECTURE SHEET EXERCISE - I (More than One correct answer Type Questions) |4 Videos

  • PROPERTIES OF TRIANGLES

    AAKASH SERIES|Exercise EXERCISE - II|148 Videos

  • PLANES

    AAKASH SERIES|Exercise ADVANCED SUBJECTIVE TYPE QUESTIONS|30 Videos

  • PROPERTIES OF VECTORS

    AAKASH SERIES|Exercise PRACTICE EXERCISES|55 Videos

Similar Questions

Explore conceptually related problems

In DeltaABC" prove that "cos^(2).(A)/(2)+cos^(2).(B)/(2)+cos^(2).(C)/(2)=2+(r)/(2R)

In DeltaABC , if a"Cos"^(2)(C)/(2)+c"Cos"^(2)(A)/(2)=(3b)/(2) , then a, b,c are in

If A, B , C =pi, then prove that cos ^(2). (A)/(2)+ cos^(2). (C)/(2)- cos^(2). (C)/(2)=2(cos. (A)/(2) cos. (B)/(2)sin. (C)/(2))

In DeltaABC, 4R "cos"(A)/(2)"cos"(B)/(2)"cos"(B)/(2)=

a cos ^(2) "" ( A) /(2) + b cos ^(2) "" ( B)/(2) = c cos ^(2) "" ( C) /(2) =

If A+B+ C =pi , then prove that cos ^(2) (A/2)+ cos ^(2) (B/2) +cos ^(2) (C/2)=2(1+sin . (A)/(2) sin. (B)/(2) sin. (C)/(2))

Show that a cos^(2) "" (A)/( 2) + b cos^(2) "" (B)/(2) + c cos^(2) "" (C )/(2) = s + (Delta )/ (R ) .

AAKASH SERIES-PROPERTIES OF TRIANGLES-PRACTICE EXERCISE
  1. In Delta ABC ( tan ""(A)/(2) - tan ""(B) /(2)) /( tan ""(A)/(2) +t...

    Text Solution

    |

  2. If a= 3, b=4, c= 5 then sin ""( A)/(2) =

    Text Solution

    |

  3. In DeltaABC , " find " b cos ^(2).(C)/(2)+c cos^(2).(B)/(2)

    Text Solution

    |

  4. (a+b+c)/( a+b+c) =

    Text Solution

    |

  5. If a= 5 , b-=12 , c=13 then tan ""(A)/(2) =

    Text Solution

    |

  6. If a= 3, b =4 , c = 5 then cos ""( A)/(2) =

    Text Solution

    |

  7. In Delta ABC , if a = 5 , b= 6 and c= 7 " then " cos ^(2) C //2 =

    Text Solution

    |

  8. In Delta ABC , if angle A = 60 ^(@) then ( 1+ (a)/(c ) +(b) /...

    Text Solution

    |

  9. Show that cot ""(A)/(2) + cot "" ( B)/(2) + cot "" ( C ) /(2)...

    Text Solution

    |

  10. ((a^(2))/( sin A)+( b^(2))/(sin B) + ( c^(2))/( sin C) ) ( sin ""(A)/...

    Text Solution

    |

  11. In Delta ABC ,(a+b+c) (tan ""(A)/(2) +tan ""(B)/(2) ) tan "" ( C) /...

    Text Solution

    |

  12. In Delta ABC , if c= (a+b) sin theta and cos theta = ( k sqrt (ab))...

    Text Solution

    |

  13. In Delta ABC , c cos ^(2) "" ( A)/(2) +a cos ^(2) "" ( C ) /(2) i...

    Text Solution

    |

  14. In Delta ABC , a sin ^(2) "" ( C ) /(2) + c sin ^(2) "" (A ) /(2) ...

    Text Solution

    |

  15. In Delta ABC , tan "" (A)/(2) , tan "" (B)/(2) are in H.P. A,b,c ...

    Text Solution

    |

  16. In Delta ABC , if (a)/( c ) = (sin (A-B))/( sin (B-C)) , " then " ...

    Text Solution

    |

  17. In Delta ABC , if cot "" (A)/(2) , cot "" ( B)/(2) , cot "" (C )/(2...

    Text Solution

    |

  18. In Delta , if cot "" (A)/(2) : cot : (B )/(2) : cot ""( C )/(2) =...

    Text Solution

    |

  19. In Delta ABC , if ( sin A)/(4) = (sin B)/(5) = (sin C)/( 6) then th...

    Text Solution

    |

  20. In Delta ABC , if a: b: c = 3: 4:5 then sin A : sin B : sin C =

    Text Solution

    |