Home
Class 12
MATHS
In Delta ABC, (cos C+ cos A)/(c+a)+(cos ...

In `Delta ABC, (cos C+ cos A)/(c+a)+(cos B)/b=`

A

`(1)/(a)`

B

`(1)/(b)`

C

`(c+a)/(b)`

D

`1`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • PERMUTATIONS AND COMBINATIONS

    SIA PUBLICATION|Exercise Problems|41 Videos

  • QUADRATIC EXPRESSIONS AND THEORY OF EQUATIONS

    SIA PUBLICATION|Exercise Problems|71 Videos

Similar Questions

Explore conceptually related problems

In Delta ABC,a(b cos C-c cos B)=

In Delta ABC, cos A + cos (B-C)=

In Delta ABC, (b-a cos C)/(c-a cos B)=

In Delta ABC , a( b cos C - c cos B) =

In Delta ABC, (cos A)/(c sin B)+(cos B)/( a sin C)+(cos C)/( b sin A) =

In Delta ABC, if (2 cos A)/a+ (cos B)/b+ (2 cos C)/c=a/(bc)+b/(ca) , then A=

In Delta ABC , (a)/( cos A) = (b) /( cos B ) = ( c ) /( cos C ) , If b= 2 then the area of the triangle is

In Delta ABC , ( bc cos A + c a cos B + ab cos C) /( cot A + cot B + cot C )=

In Delta ABC , prove that cos. (A)/(2)+cos. (B)/(2) - cos .(C)/(2)=4cos .(pi+A)/(4) cos. (pi+B)/(4) cos. (pi-C)/(4)

In a Delta ABC, a (cos^2 B+cos^2 C)+cos A(c cos C+b cos B)=

SIA PUBLICATION-PROPERTIES OF TRIANGLES, HEIGHTS AND DISTANCES-Problems
  1. If b +c =3a , then find the value of cot.(B)/(2)cot.(C)/(2)

    Text Solution

    |

  2. The elevation of an object on a hill is observed from a certain point...

    Text Solution

    |

  3. In a DeltaABC,sum(b+c)tan""A/2tan((B-C)/2)=

    Text Solution

    |

  4. Two sides of a triangle are given by the roots of the equation x^2-5x+...

    Text Solution

    |

  5. In a Delta ABC, a (cos^2 B+cos^2 C)+cos A(c cos C+b cos B)=

    Text Solution

    |

  6. A tower, of x metres high, has a flagstaff at its top. The tower and t...

    Text Solution

    |

  7. IF in a Delta ABC, r3=r1+r2+r, then angle A+ angle B=

    Text Solution

    |

  8. In a triangleABC, (a-b)^2 cos^2(C )/(2)+(a+b)^2 sin^2(C )/(2) is equal...

    Text Solution

    |

  9. In a triangleABC, the correct formulae, among the following are I r...

    Text Solution

    |

  10. An aeroplane flying with uniform speed horizontally one kilometer abov...

    Text Solution

    |

  11. In Delta ABC, if r1 lt r2 lt r3 then

    Text Solution

    |

  12. In Delta ABC if b=20,c=21 and sin A=3//5, then a=

    Text Solution

    |

  13. A tower subtends angles alpha,2 alpha, 3 alpha respectively at points ...

    Text Solution

    |

  14. If the altitudes of a triangle are in arithmetic progression, then the...

    Text Solution

    |

  15. In Delta ABC, (cos C+ cos A)/(c+a)+(cos B)/b=

    Text Solution

    |

  16. If triangleABC is right angle at A, then r2+r3 is equal to

    Text Solution

    |

  17. From a point on the level ground, the angle of elevation of the top of...

    Text Solution

    |

  18. In Delta ABC, if a/(b^2-c^2)+c/(b^2-a^2)=0 then B=

    Text Solution

    |

  19. In Delta ABC,a^2 sin 2C+c^2 sin 2A=

    Text Solution

    |

  20. The shadow of the tower standing on a level ground is found to be 60 m...

    Text Solution

    |